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  #1  
Old 02-22-2012, 12:33 AM
tattooedsurvivaldude tattooedsurvivaldude is offline
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M&P .40 with option to use 9mm barrel? M&P .40 with option to use 9mm barrel? M&P .40 with option to use 9mm barrel? M&P .40 with option to use 9mm barrel? M&P .40 with option to use 9mm barrel?  
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Hey guys, so I know that Sig does this, but I'm about to purchase the m&p 9mm, until I read a post in a thread about a guy about to buy a m&p 40 and purchase a 9mm barrel to go with it so he can have both calibers.

I haven't gotten a response from him yet so I'm asking y'all if you know about it or have this setup and it's PRO's and CON's.

Thanks guys...
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Old 02-22-2012, 09:51 AM
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The recess in the slide is sized for .40 cal. Therfore you will potentially lose a little bit of engagement with the extracter. There are several threads here where folks have done this.

I haven't done it, but I looked over the part numbers. The 9mm magazine is different from the .40/.357SIG. Some folks report the .40 mags work OK with 9mm rounds, but if it does not, you have the option to buy 9mm mags ($25 each). You potentially have 3 calibers. 9mm, .357Sig, and .40 cal. .357 SIG is .40 cal necked down to 9mm. In some bullet weights it is supposed to be very similar to .357 magnum. Midway has barrels.

CDNN has M&P.357 Sig for $399 and nite sights for $30 additional.

Last edited by jaykellogg; 02-22-2012 at 09:53 AM.
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Old 02-22-2012, 10:58 AM
Double-O-Dave Double-O-Dave is offline
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M&P .40 with option to use 9mm barrel? M&P .40 with option to use 9mm barrel? M&P .40 with option to use 9mm barrel? M&P .40 with option to use 9mm barrel? M&P .40 with option to use 9mm barrel?  
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If you have any desire to make a multi-caliber pistol, you will need to buy an M&P in either a .40 S&W or .357 Sig caliber, then purchase the 9mm barrel separately. The .40 S&W and .357 Sig use the same magazines, and have the same capacity. You will most probably need 9mm magazines for proper feeding from the magazine into the breech. I have a M&P 40C (compact) that I bought a Storm Lake 9mm barrel and 9mm magazines for. This combination works well, and is a fairly cheap conversion to make. I've never fired a .357 Sig, and I doubt I would ever purchase a .357 Sig barrel unless they were practically giving them away (I'm very pleased with the .40 S&W, and the 9mm gives me the ability to shoot cheap practice ammo).

By the way, as a point of reference, I believe I paid around $90.00 for my (used) Storm Lake 9mm barrel, and (approx.) $25.00 for the magazines (12 round capacity).

Best of luck,

Dave

2/23/12: for what it's worth, I found the (Forum) sales ad for the Storm Lake 9mm barrel and magazines:

Storm Lake S&W M&P Compact 40cal to 9mm conversion.
For sale is an excellent condition Storm Lake S&W M&P40 C to 9mm conversion with 3 magazines. All for $155. The barrel alone is $148 at Midway. The barrel is blued. Works perfectly. Please email me for pictures. Shipping is $5. Thanks.

As I recall, both factory and aftermarket replacement barrels were out of stock and/or hard to come by when I was looking for this a couple of years ago.

Best of luck,

Dave

Last edited by Double-O-Dave; 02-23-2012 at 11:18 PM. Reason: added information
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Old 02-22-2012, 12:16 PM
tattooedsurvivaldude tattooedsurvivaldude is offline
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M&P .40 with option to use 9mm barrel? M&P .40 with option to use 9mm barrel? M&P .40 with option to use 9mm barrel? M&P .40 with option to use 9mm barrel? M&P .40 with option to use 9mm barrel?  
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Thanks guys, yea I've read the few posts that I found and so far seems that it's mostly a hit or miss. I want to try it but not if there are more CON's then PRO's. I originally was going to purchase the 9mm, but saw the post about the conversion drop in, and thought "Hey, that's a pretty slick idea, drop the 9mm barrel in and use it at the range."

So I just wanted to get people's opinions and personal experience from this.

Does anyone know if 9mm is more available then .40? I'm a gun noob so please excuse the questions if they seem in-experienced. This would be my first handgun purchase and ownership. I wanted to get the 9mm because ammo is cheaper and what i gather more available. I also like the size increase of the .40 over the 9mm plus you only lose 2 rounds going from 9mm to .40.
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Old 02-22-2012, 12:30 PM
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They're starting to get hard to find in Asheville. I found 2 9mm FS pistols. One new and one had 68 rounds through it. I bought the new one for $20 more. As I said CDNN has some listings for .40, 9mm and ,357 SIG. They want $429 for the 9 and .40 and $399 for the .357SIG. Also they offer nite sights (which I very much like) on the .357 for $30 additional.

I think a lot of people are buying pistols with their tax refunds.
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Old 02-22-2012, 07:58 PM
tattooedsurvivaldude tattooedsurvivaldude is offline
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Quote:
Originally Posted by Double-O-Dave View Post
If you have any desire to make a multi-caliber pistol, you will need to buy an M&P in either a .40 S&W or .357 Sig caliber, then purchase the 9mm barrel separately. The .40 S&W and .357 Sig use the same magazines, and have the same capacity. You will most probably need 9mm magazines for proper feeding from the magazine into the breech. I have a M&P 40C (compact) that I bought a Storm Lake 9mm barrel and 9mm magazines for. This combination works well, and is a fairly cheap conversion to make. I've never fired a .357 Sig, and I doubt I would ever purchase a .357 Sig barrel unless they were practically giving them away (I'm very pleased with the .40 S&W, and the 9mm gives me the ability to shoot cheap practice ammo).

By the way, as a point of reference, I believe I paid around $90.00 for my (used) Storm Lake 9mm barrel, and (approx.) $25.00 for the magazines (12 round capacity).

Best of luck,

Dave
That's exactly what I was thinking I would do. Have you had any issues dropping in the 9mm barrel and shooting it? I've heard of problems with the Storm Lake conversion barrel, but not the stock S&W one.

I'm having a tough time deciding between 9mm and .40 lol. This would be my first handgun and dont want to acquire a .45 till I was comfortable and trained.
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Old 02-22-2012, 08:27 PM
Double-O-Dave Double-O-Dave is offline
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I have had zero problems with the Storm Lake 9mm barrel. I've read several reports that the Storm Lake barrel is actually more accurate than the factory barrel. I don't know if that's true or not. I get excellent accuracy from both the factory .40 S&W barrel, as well as from the aftermarket Storm Lake 9mm barrel. Generally speaking, 9mm ammo will be more readily available, and cheaper than .40 S&W. .357 Sig ammo is pretty hit and miss with regards to availability, and the price is pretty high. I noticed you mentioned this will be your first handgun. If you are looking to maximize your experience, and minimize your costs, I would strongly suggest buying a .22 caliber handgun to start with. You should look at either a modern, double action revolver, or a semi-auto pistol. S&W and Ruger make excellent quality, and affordable .22 caliber semi-autos that would be excellent training guns. .22 caliber ammo is cheap and plentiful. You can build good habits with the .22 before moving on to more powerful center fire calibers. Bad habits are hard to break, but easy to develop. If you have your heart set on a center fire caliber, I'd consider a used .38 Special revolver to start with - especially one with a 4.0 inch barrel. They are inherently accurate, and easy to learn on. .38 Special ammo is easy to come by, and should be affordable - more so than .40 S&W ammo. The .38 Special revolver is very versatile and can be used for informal target shooting, self/home defense, and small game hunting. It is my favorite caliber and I own more .38 Special / .357 Magnum revolvers than any other revolver or semi-auto in my collection.

Best of luck,

Dave
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Old 02-22-2012, 09:28 PM
tattooedsurvivaldude tattooedsurvivaldude is offline
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Quote:
Originally Posted by Double-O-Dave View Post
I have had zero problems with the Storm Lake 9mm barrel. I've read several reports that the Storm Lake barrel is actually more accurate than the factory barrel. I don't know if that's true or not. I get excellent accuracy from both the factory .40 S&W barrel, as well as from the aftermarket Storm Lake 9mm barrel. Generally speaking, 9mm ammo will be more readily available, and cheaper than .40 S&W. .357 Sig ammo is pretty hit and miss with regards to availability, and the price is pretty high. I noticed you mentioned this will be your first handgun. If you are looking to maximize your experience, and minimize your costs, I would strongly suggest buying a .22 caliber handgun to start with. You should look at either a modern, double action revolver, or a semi-auto pistol. S&W and Ruger make excellent quality, and affordable .22 caliber semi-autos that would be excellent training guns. .22 caliber ammo is cheap and plentiful. You can build good habits with the .22 before moving on to more powerful center fire calibers. Bad habits are hard to break, but easy to develop. If you have your heart set on a center fire caliber, I'd consider a used .38 Special revolver to start with - especially one with a 4.0 inch barrel. They are inherently accurate, and easy to learn on. .38 Special ammo is easy to come by, and should be affordable - more so than .40 S&W ammo. The .38 Special revolver is very versatile and can be used for informal target shooting, self/home defense, and small game hunting. It is my favorite caliber and I own more .38 Special / .357 Magnum revolvers than any other revolver or semi-auto in my collection.

Best of luck,

Dave
Well thank you very much for the info and opinions =] I considered a .22 at first but as a new father of a 10 month old baby girl, and not living in the best of areas, I wanted the handgun to be a bit more powerful for home and self defense.

I've shot .22, 9mm, 308, 30-06, I shoot well with a 9mm. So that's why I considered stepping it up a bit to a .40 with an option of a 9mm barrel. It just seems like having 2 guns in one is pretty handy and is cheaper than buying both guns.
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Old 02-22-2012, 09:30 PM
tattooedsurvivaldude tattooedsurvivaldude is offline
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Quote:
Originally Posted by jaykellogg View Post
They're starting to get hard to find in Asheville. I found 2 9mm FS pistols. One new and one had 68 rounds through it. I bought the new one for $20 more. As I said CDNN has some listings for .40, 9mm and ,357 SIG. They want $429 for the 9 and .40 and $399 for the .357SIG. Also they offer nite sights (which I very much like) on the .357 for $30 additional.

I think a lot of people are buying pistols with their tax refunds.
Yea, almost everyone I talk to about guns lately is buying some with their tax returns haha. I encourage it, before something happens to guns and their prices, or with whats going on with the economy, get em while you can. Who knows whats going to happen in the near future.
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Old 02-22-2012, 10:24 PM
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I'm having a tough time deciding between 9mm and .40 lol. This would be my first handgun and dont want to acquire a .45 till I was comfortable and trained.
The .40 will have a punchier recoil than the .45, and many .40 rounds have more power than .45 rounds.

The .40 is not 'less' of a gun than the .45. If you want an easier shooting gun, get the .45.

If you want the ability to drop a $60 factory 9mm barrel in and rip off a few thousand 9mm rounds, get the .40.
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Old 02-22-2012, 10:34 PM
tattooedsurvivaldude tattooedsurvivaldude is offline
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The .40 will have a punchier recoil than the .45, and many .40 rounds have more power than .45 rounds.

The .40 is not 'less' of a gun than the .45. If you want an easier shooting gun, get the .45.

If you want the ability to drop a $60 factory 9mm barrel in and rip off a few thousand 9mm rounds, get the .40.
I've never had the chance to shoot the .45, a .40's recoil is greater than the .45?

I like the idea of the versatility of being able to shoot 9mm with a .40 caliber gun. Two guns in one if you will.
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Old 02-23-2012, 10:16 AM
VMaxSplat VMaxSplat is offline
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Quote:
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I've never had the chance to shoot the .45, a .40's recoil is greater than the .45?
The recoil impulse is different. The 45 is more of a push and less snap than a 40. Both are great rounds and the 40FS will give you a 50% mag capacity increase over the 45FS.

Quote:
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I like the idea of the versatility of being able to shoot 9mm with a .40 caliber gun. Two guns in one if you will.
That is a benefit because the 9mm is much cheaper to shoot than the 40 or 45.
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Old 02-23-2012, 03:48 PM
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Midway seems to be out of most everything except one of the Storm Lake barrels but honestly I'm going to go with a factory one, if I can find one.
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Old 02-23-2012, 06:13 PM
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Quote:
Originally Posted by tattooedsurvivaldude View Post
Thanks guys, yea I've read the few posts that I found and so far seems that it's mostly a hit or miss. I want to try it but not if there are more CON's then PRO's. I originally was going to purchase the 9mm, but saw the post about the conversion drop in, and thought "Hey, that's a pretty slick idea, drop the 9mm barrel in and use it at the range."

So I just wanted to get people's opinions and personal experience from this.

Does anyone know if 9mm is more available then .40? I'm a gun noob so please excuse the questions if they seem in-experienced. This would be my first handgun purchase and ownership. I wanted to get the 9mm because ammo is cheaper and what i gather more available. I also like the size increase of the .40 over the 9mm plus you only lose 2 rounds going from 9mm to .40.
You can just buy the 40 cal and then purchase the drop in barrel in 9mm everything functions fine, and yes get 9mm mags so you don't risk feed problems being you can put 9mm in 40 cal mags but once again you risk feed problems, but I wished I could buy the barrels directly from S&W for the conversion as opposed to a 3rd party company.
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Old 02-23-2012, 07:25 PM
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I recommend buying the 40 and getting the 9mm conversion barrel, however you may want to keep an eye on the Apex Tactical website. I believe I read that one of the better barrel makers, Bar-Sto I think, is going to be offering a 9mm conversion barrel in the near future, and sold by Apex. Lots of people are expecting superb accuracy from these barrels.

I also seem to recall seeing a few posts in the M&P pistol section where some people talk about buying the standard 9mm barrel directly from S&W for about $60, and using them in their 40 cal guns.

Last edited by wantmoresmiths; 02-23-2012 at 07:27 PM.
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Old 02-23-2012, 07:25 PM
jpham209 jpham209 is offline
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I have a m&p40 and 40c. I use 9mm factory barrels for both. Shoots great but try to use the 9mm mags because the 40 mags don't work that well. It's true the barrels are sold out everywhere. eBay has the factory and storm lake barrels for sale. Hope it helps you.
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Old 02-23-2012, 08:47 PM
tattooedsurvivaldude tattooedsurvivaldude is offline
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Midway seems to be out of most everything except one of the Storm Lake barrels but honestly I'm going to go with a factory one, if I can find one.
Yea, I hear they are out everywhere and everyone is just ordering one and waiting for them to come in lol.
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Old 02-23-2012, 08:51 PM
tattooedsurvivaldude tattooedsurvivaldude is offline
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I recommend buying the 40 and getting the 9mm conversion barrel, however you may want to keep an eye on the Apex Tactical website. I believe I read that one of the better barrel makers, Bar-Sto I think, is going to be offering a 9mm conversion barrel in the near future, and sold by Apex. Lots of people are expecting superb accuracy from these barrels.

I also seem to recall seeing a few posts in the M&P pistol section where some people talk about buying the standard 9mm barrel directly from S&W for about $60, and using them in their 40 cal guns.
I too have read this. So I'll be just waiting. I'm still debating the .40. I mean, it sounds like an awesome idea, to get a bigger caliber pistol, that has an option to convert another caliber. Very versatile. Especially on the range. Say you run out of a caliber, and your buddy has got some of the other...YANK. Done and done haha.
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Old 02-23-2012, 09:35 PM
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I love all my 9mm's but bought a M&P40C just so I could convert to both a .357 and the 9mm.

I will be picking up my M&P45 tomorrow and will have three M&P's but am still waiting for a 357 barrel from S&W so then I would actually have 4 M&P's, also just received my 14 round mag made by S&W with an X-Grip glued to the mag from 44mag.com in todays mail so tomorrow I guess I s[end some time alone with my new gun at the range after I get off work!
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Old 02-23-2012, 11:20 PM
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>>>Bad habits are hard to break, but easy to develop<<<

Very true. From as early as possible, try to develop a routine--'habits', especially on the range. My wife got into shooting later than me, but she's a great example--she's almost ritualistic in that she always places our guns, magazines, ammo and other gear in the same places, moves with a paradoxical combination of robotic grace--nothing 'herky jerky' in the slightest, but very fluid and consistent. She's a pretty darn good shot for being 5ft tall and 90 pounds--she can go from 45 ACP to 40, 38, 22, to 380, Glock, Springfield, S&W, Sig, etc, using semi autos or revolvers in pretty much any order and still manage tight groups. Sort of proof that as long as you have two good hands, the size of the grips doesn't have to matter that much.

It came naturally to her, but for a lot of us, including me, it was worth while sitting back, watching her and other folks 'out on the range'--people who have consistent form and habits.

If you don't have that now, you can still get better--just sit back a spell and watch others, especially the old timers.

As Yogi Berra said, "You can observe a lot by watching"
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Old 01-01-2013, 09:36 PM
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Rather than starting another thread, I thought I would just tag my question on the end of this one

I was told you can't/shouldn't use a "factory" SW 9mm barrel in a 40cal gun. Something about the breech being fractionally smaller.

Is this true or is it safe.

The reason I ask, I have a M&P9 threaded and have a 40 coming(someday) in the mail(ffl). I wanted to keep the factory 9mm threaded barrel and sell off the gun with the "standard" factory barrel(came with both).
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Old 01-01-2013, 09:50 PM
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Rather than starting another thread, I thought I would just tag my question on the end of this one

I was told you can't/shouldn't use a "factory" SW 9mm barrel in a 40cal gun. Something about the breech being fractionally smaller.

Is this true or is it safe.

The reason I ask, I have a M&P9 threaded and have a 40 coming(someday) in the mail(ffl). I wanted to keep the factory 9mm threaded barrel and sell off the gun with the "standard" factory barrel(came with both).
If this were true, those of us who have converted our Shield .40 to 9mm for that past few months would have already blew our hands off.

I've been shooting my Shield .40 with the factory 9mm barrel out of my Shield 9mm since September. Recently I purchased another 9mm barrel for the puprose of letting my ole lady carry the Shield 9mm on her at all times. Now i have a 9mm barrel for my .40 to shoot at the range.......No problems since September and i've put well over 3K rounds through it.
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Old 01-01-2013, 10:11 PM
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M&amp;P .40 with option to use 9mm barrel? M&amp;P .40 with option to use 9mm barrel? M&amp;P .40 with option to use 9mm barrel? M&amp;P .40 with option to use 9mm barrel? M&amp;P .40 with option to use 9mm barrel?  
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Originally Posted by Smitty357 View Post
If this were true, those of us who have converted our Shield .40 to 9mm for that past few months would have already blew our hands off.

I've been shooting my Shield .40 with the factory 9mm barrel out of my Shield 9mm since September. Recently I purchased another 9mm barrel for the puprose of letting my ole lady carry the Shield 9mm on her at all times. Now i have a 9mm barrel for my .40 to shoot at the range.......No problems since September and i've put well over 3K rounds through it.
Smitty do you use the 40 mags to shoot the 9mm rounds or did you purchase a 9mm mag also for your shield?
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  #24  
Old 01-01-2013, 10:40 PM
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M&amp;P .40 with option to use 9mm barrel? M&amp;P .40 with option to use 9mm barrel? M&amp;P .40 with option to use 9mm barrel? M&amp;P .40 with option to use 9mm barrel? M&amp;P .40 with option to use 9mm barrel?  
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Man, I don't have anywhere near 3K rounds through my FS .40 with the 9mm factory barrel -- only a little over 600 rounds, but Ii will say that my accuracy has been the same or better with the factory 9mm vs. the .40 cal. barrel. And as far as the 9 mm mags go, no feed problems at all, so I would recommend getting the 9mm mags.
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  #25  
Old 01-01-2013, 10:40 PM
mptoledo mptoledo is offline
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M&amp;P .40 with option to use 9mm barrel? M&amp;P .40 with option to use 9mm barrel? M&amp;P .40 with option to use 9mm barrel? M&amp;P .40 with option to use 9mm barrel? M&amp;P .40 with option to use 9mm barrel?  
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Thanks for the input. Being unfamiliar with the M&P line, I wanted to make sure I didn't do somehting stupid

I have owned many of the Revolvers, 629,686, 2x 500's and my current carry is a 360pd(357mag).
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  #26  
Old 01-01-2013, 11:04 PM
1sailor 1sailor is offline
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M&amp;P .40 with option to use 9mm barrel? M&amp;P .40 with option to use 9mm barrel? M&amp;P .40 with option to use 9mm barrel? M&amp;P .40 with option to use 9mm barrel? M&amp;P .40 with option to use 9mm barrel?  
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I'm coming in on theis thread a little late but here goes anyway. I have an M&P40 that I picked up a 9mm barrel for and after about 200 rounds picked up a couple of 9mm mags also. using the 40 cal mags i often would not feed the last 9mm. since picking up the 9mm mags I have put close to 6000 rounds of 9mm down the pipe and do not recall a single malfunction. Accuracy is on a par with the .40 cal from a sitting position at 50ft and a little better shooting offhand at the same range. typical groups sitting are a little under 2" with 10 rounds.
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Old 01-01-2013, 11:26 PM
Smitty357 Smitty357 is offline
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M&amp;P .40 with option to use 9mm barrel? M&amp;P .40 with option to use 9mm barrel? M&amp;P .40 with option to use 9mm barrel? M&amp;P .40 with option to use 9mm barrel? M&amp;P .40 with option to use 9mm barrel?  
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Quote:
Originally Posted by 2001gmc View Post
Smitty do you use the 40 mags to shoot the 9mm rounds or did you purchase a 9mm mag also for your shield?
I currently use the 9mm mag and the 9mm barrel when shooting it in my .40. I do this because I have used the .40 mag with the 9mm barrel, but I often came across some FTFeed) issues. Mostly towards the lower capacity part of the mag.

The 9mm mag just assures you that it will feed the 9mm rds properly. So just get a 9mm barrel and a 9mm mag, u'll be good to go without issues.
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  #28  
Old 01-02-2013, 10:17 AM
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M&amp;P .40 with option to use 9mm barrel? M&amp;P .40 with option to use 9mm barrel? M&amp;P .40 with option to use 9mm barrel? M&amp;P .40 with option to use 9mm barrel? M&amp;P .40 with option to use 9mm barrel?  
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On a similar note, I recently purchased the M&P 9 full sized before hearing that you could put a 9mm barrel into the .40. I did this mainly because the 9 is cheaper to shoot, however recently it has become VERY difficult to get it where I , but .40 is fairly plentiful.

Is it possible to put a .40 barrel into a 9mm? If not, how about a full .40 slide?

Thanks for any input.
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Old 01-02-2013, 05:51 PM
mptoledo mptoledo is offline
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M&amp;P .40 with option to use 9mm barrel? M&amp;P .40 with option to use 9mm barrel? M&amp;P .40 with option to use 9mm barrel? M&amp;P .40 with option to use 9mm barrel? M&amp;P .40 with option to use 9mm barrel?  
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You guys need to please specify when you say a "9mm barrel". Are you talking a "factory" barrel or "aftermarket" barrel?

I have heard the stormlake conversions are made exactly to spec as the 40 "factory" except for the bore size. Meaning it will seat perfectly in the 40cal gun. Where as the 9mm is a bit thinner and doesn't seat "perfectly" in the 40 cal.

Thanks, MP>
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  #30  
Old 01-02-2013, 06:53 PM
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M&amp;P .40 with option to use 9mm barrel? M&amp;P .40 with option to use 9mm barrel? M&amp;P .40 with option to use 9mm barrel? M&amp;P .40 with option to use 9mm barrel? M&amp;P .40 with option to use 9mm barrel?  
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Do not try to go the other way (9mm slide/frame with factory .40) -- it will not fit together.

And Smitty and robkarrob and I are all talking about factory S&W barrels, not aftermarket barrels by another mfr.
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  #31  
Old 01-09-2013, 04:05 PM
mptoledo mptoledo is offline
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M&amp;P .40 with option to use 9mm barrel? M&amp;P .40 with option to use 9mm barrel? M&amp;P .40 with option to use 9mm barrel? M&amp;P .40 with option to use 9mm barrel? M&amp;P .40 with option to use 9mm barrel?  
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Thanks for the replies. I have the 40 sitting at my FFL and will pick up friday along with 3 ar lowers I took my 9mm with threaded barrel out to the range for the first time and it was nice and accurate. I put my YHM cobra 45 suppressor on it(got the adapter from YHM) and it would not cycle. It would shoot the first round fine, but wouldn't push the slide back far enough to cycle the next round..

Do I need to get a different spring for it to work properly?

By the way.. I used American Eagle 147 gr and it was stupid quiet!! Much quieter than the 22lr 2 benches down from me!!

PS, Yep, aware of the not going to a 40cal on a 9mm, but thanks for looking out for me
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  #32  
Old 02-11-2013, 12:53 PM
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M&amp;P .40 with option to use 9mm barrel? M&amp;P .40 with option to use 9mm barrel? M&amp;P .40 with option to use 9mm barrel? M&amp;P .40 with option to use 9mm barrel? M&amp;P .40 with option to use 9mm barrel?  
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Default SW .40 - 9mm Conversion

I too was just looking at buying the M&P 9mm and then started browsing the forum and read about the .40 conversion to 9mm. So I went to the local gun store and rented the .40 to see how it felt... WOW! It was amazingly accurate and softer than my friend's .40 glock we had with us. So I have decided that's the route I'm going to go, buy the M&P .40 and the aftermarket barrel with 9mm mags.. but the one thing I haven't seen mentioned, or I missed it completely... do you just use the same spring and guiderod that comes in the .40? Is there any difference between the springs in the calibers? From what I'm reading, you are all only buying the 9mm barrel and mags, correct? Thanks for any comments on this.
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  #33  
Old 02-11-2013, 01:15 PM
Smitty357 Smitty357 is offline
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M&amp;P .40 with option to use 9mm barrel? M&amp;P .40 with option to use 9mm barrel? M&amp;P .40 with option to use 9mm barrel? M&amp;P .40 with option to use 9mm barrel? M&amp;P .40 with option to use 9mm barrel?  
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Quote:
Originally Posted by sdeeut69 View Post
I too was just looking at buying the M&P 9mm and then started browsing the forum and read about the .40 conversion to 9mm. So I went to the local gun store and rented the .40 to see how it felt... WOW! It was amazingly accurate and softer than my friend's .40 glock we had with us. So I have decided that's the route I'm going to go, buy the M&P .40 and the aftermarket barrel with 9mm mags.. but the one thing I haven't seen mentioned, or I missed it completely... do you just use the same spring and guiderod that comes in the .40? Is there any difference between the springs in the calibers? From what I'm reading, you are all only buying the 9mm barrel and mags, correct? Thanks for any comments on this.
Just change the barrel, everything else stays the same. Unless of course u also want to use a 9mm mag. The .40 mag will work also with 9mm if u want to save urself a little money.
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  #34  
Old 02-24-2013, 02:03 AM
thedukeoftank thedukeoftank is offline
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M&amp;P .40 with option to use 9mm barrel? M&amp;P .40 with option to use 9mm barrel? M&amp;P .40 with option to use 9mm barrel? M&amp;P .40 with option to use 9mm barrel? M&amp;P .40 with option to use 9mm barrel?  
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I too recently purchased a M&P 40 with the intention of having a dual caliber pistol. Everything I have read on the caliber change seems pretty straight forward. The only issue I have seen so far is from a youtube video - Update! M&P40 conversion to M&P9 - YouTube

Looks like a FTE from cheap 115gr FMJ rounds. Now, the main reason I want to do the caliber conversion is the much cheaper ammo. Any ideas on this? One commenter advised changing the recoil spring to a lower lb spring.
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  #35  
Old 02-12-2017, 10:30 AM
mrrstrat mrrstrat is offline
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M&amp;P .40 with option to use 9mm barrel? M&amp;P .40 with option to use 9mm barrel? M&amp;P .40 with option to use 9mm barrel? M&amp;P .40 with option to use 9mm barrel? M&amp;P .40 with option to use 9mm barrel?  
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For what it is worth:

I have an older M&P 40 w/o thumb safety and I bought a S&W brand factory replacement 9mm barrel and some S&W brand 9mm mags for my 9mm conversion.

I found the gun works great as expected with the same accuracy. I shot a bunch of a couple different types of ammo and am convinced I have no issues to expect.

I have heard with the barrel and mag in 9mm the 40 caliber model has the same recoil spring, extractor and spring, striker spring as the M&P 9 so it essentially becomes the M&P 9. I thought I read somewhere the bolt face was also dimensionally the same meaning the slide components are also the same.

Is the bolt face - where the cartridge meets the striker pin - and the place the extractor expects it exactly the same? Maybe someone with both M&P 9 and 40 can speak up.
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  #36  
Old 02-12-2017, 11:31 AM
mrrstrat mrrstrat is offline
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M&amp;P .40 with option to use 9mm barrel? M&amp;P .40 with option to use 9mm barrel? M&amp;P .40 with option to use 9mm barrel? M&amp;P .40 with option to use 9mm barrel? M&amp;P .40 with option to use 9mm barrel?  
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Update: I have ordered the Stormlake 40-to-9 conversion barrel for my M&P 40. I believe this is the agreed proper way as the external dimensions match the 40 correctly. Since safety is number 1 I have to ask: "Is anyone in the market for a slightly used factory 9mm 4.25" barrel?"
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