Shield 9 to 40. Anyone have any problems?

[monkey wrench]

I know a lot of the conversion talk has been beat to death on the 40 to 9 but I searched and only found a couple threads on the 9 to 40 switch. I have read how to do it just wanting to hear from the ones that have actually done it and if they had any problems. Pretty sure if you get the tang cut down right there won't be a bit of trouble but doesn't hurt to ask. So if you have done it let me know.

 

[OKFC05]

Hope you realize that the 40 to 9 is a drop in, and the 9 to 40 is major surgery because the .40 casehead is larger than the 9mm casehead.
You can undo the 40 to 9mm conversion in a few seconds by removing the barrel, but the modifications to the 9mm breechface void your warranty going 9 to 40. That's the main reason few are interested.

 

[monkey wrench]

From everything I have read posted here everything is the same except for the top tang of the barrel. In which you have to take about .10 off each side to allow it to fit. So are you saying they machine the breech face where the firing pin comes through to a different size?

 

[Jyezahn]

From everything I have read posted here everything is the same except for the top tang of the barrel. In which you have to take about .10 off each side to allow it to fit. So are you saying they machine the breech face where the firing pin comes through to a different size?

Larger casing... makes sense.

 

[Smitty357]

Hope you realize that the 40 to 9 is a drop in, and the 9 to 40 is major surgery because the .40 casehead is larger than the 9mm casehead.
You can undo the 40 to 9mm conversion in a few seconds by removing the barrel, but the modifications to the 9mm breechface void your warranty going 9 to 40. That's the main reason few are interested.

You guys need to read up on the 9 to 40 a little more.

You dont have to worry about warranty problems. Because u are grinding the tangs down on the 40 barrel (no the 9mm slide). In this case the only thing u are hurting is the 40 barrel and obviously ur not worried about a warranty on that part anyways.

Just grind the tangs down on the 40 barrel and drop it right into your 9mm slide. After thats done, it swaps out just as easy as the 40 to 9mm conversion.

Click, the link and scroll to Page 3.

http://smith-wessonforum.com/smith-wesson-m-p-pistols/280665-converted-my-shield-40-9mm.html

 

[monkey wrench]

The only thing I noticed in the pictures in the other thread was that the .40 looked pretty tight in the extractor. It may not be as tight as it looks in the pictures, just hard to tell.

 

[monkey wrench]

Forgot to say may go get a .40 round from my brother and just see how it fits in the face.

 

[NUTTBALL763]

Here's a question... Why would you want to go from 9mm to .40? There is absolutely no reason to do so. Plus on a side note, the Shield in 9mm has been great. Pretty much all the issues with the Shields have been the .40 version. If you want a .40 caliber Shield there are plenty of people who will trade you.

 

[Smitty357]

Here's a question... Why would you want to go from 9mm to .40? There is absolutely no reason to do so. Plus on a side note, the Shield in 9mm has been great. Pretty much all the issues with the Shields have been the .40 version. If you want a .40 caliber Shield there are plenty of people who will trade you.

So you're saying those of us with the .40 should have just traded for a 9mm, LMAO. No thanks, i'd rather keep the weapon that im perfectly comfortable with. Actually I wouldnt even trade my .40 for another .40. Though they are both the same weapons. In my hands, they are actually both 2 different weapons. My hands are married to the one I currently own. So why not convert it to shoot both calibers.

 

[rsrocket1]

Here's a question... Why would you want to go from 9mm to .40? There is absolutely no reason to do so.

Maybe he wants to know how a real handgun caliber feels?

 

[Smitty357]

Maybe he wants to know how a real handgun caliber feels?

LMAO, i think I agree (a little).

Also, if you think about it. All of the Shield .40 and 9mm barrels are on back order around the country. Now my guess would be it isnt because a .9mm owner wants another 9mm backup barrel or visa versa. And i'm pretty sure those people with AR's arent just trying to drop Shield barrels into their weapons.

There MUST be a reason behind all of this.

 

[robkarrob]

Casehead size is not an issue with the 9mm to 40 conversion, as both guns use the same extractor and ejector.



There are only a very few differences between the Shield 40 and Shield 9mm. They are:

1. Barrels have different bore size and different tang widths (at the top rear of the barrel).

2. Magazines are different on the inside width, due to different sized grooves in the sides of the mag tube. The mags both have the same dimensions on the outside. They are marked 9mm and 40S&W. The holes, punched to show how many cartridges are loaded, are different.

3. The slides are different only at the top slot width, machined to fit the tang on the matching barrel. They slides are engraved/marked Shield 9 or Shield 40.

That is all the differences. All the other parts can be swapped from one model to the other.

Bob

 

[norsmis]

So you're saying those of us with the .40 should have just traded for a 9mm, LMAO. No thanks, i'd rather keep the weapon that im perfectly comfortable with. Actually I wouldnt even trade my .40 for another .40. Though they are both the same weapons. In my hands, they are actually both 2 different weapons. My hands are married to the one I currently own. So why not convert it to shoot both calibers.

+1!!!!!! I love my .40 and have had zero problems with it. I may try and find a 9mm barrel later on as it is a little much for my 12 year old to shoot but he can still manage for now.
I dont think I will be trading my .40 for a 9mm.

 

[Dieselscout80]

I'd like to know if the same mod to a 40 barrel works on the M&P full size and compacts 9mms too?

 

[monkey wrench]

Here's a question... Why would you want to go from 9mm to .40? There is absolutely no reason to do so. Plus on a side note, the Shield in 9mm has been great. Pretty much all the issues with the Shields have been the .40 version. If you want a .40 caliber Shield there are plenty of people who will trade you.

Ok here is an answer because I can find .40 ammo. May be different where you live but not here. I can come by .40 ammo easier than 9 any day of the week. Also I forgot that I had bought a .40 snap cap at a gun show anticipating getting my shield .40 but the 9 came in first so I took it, anyway took the slide off and stuck the snap cap in and to me just seemed a little tight. I'm not saying it won't work because I'm sure it will but just a little tight for my taste. Think if I do anything I'll just wait till a .40 comes in and trade or find someone with a .40 that wants a 9. Nothing wrong with the 9 but one of those deals where I wanted one and settled for the other and kind of regret it.

 

[monkey wrench]

Casehead size is not an issue with the 9mm to 40 conversion, as both guns use the same extractor and ejector.

I'm not 100% on exact terminology about somethings so I'll try and describe what I'm talking about. Are the what I would call the breech face, meaning the flat part where the primer end of the case sits and where the firing pin hole is, the same width from one side to the extractor arm? That's the only thing that seemed like it could possibly cause a problem. The actually .40 slide may be the same way but I don't have one so I can't compare them.

 

[Jyezahn]

meaning the flat part where the primer end of the case sits and where the firing pin hole is, the same width from one side to the extractor arm?

This is what I was thinking. I know I can't get a 40cal round to fit my SD9VE slide, so I would think that would be the same for the Shield. Otherwise, what does the slide lock up with when feeding? Can anyone with a Shield 9mm, show a pic of a 40cal round locked into the extractor and firing pin face?

 

[monkey wrench]

Well decided just gonna wait till a .40 comes in and trade the 9 in on it and get what I originally wanted. It will probably be a while but I do at least have one to carry for now.

 

[Smitty357]

It works perfect either way guys, .40 to 9mm (no mod) or 9mm to .40 (slight mod). After its all said and done you will have no problems shooting either caliber through which ever conversion u decide to make.

Noone who had ever converted their Shield to either caliber has ever complained about anything. Even the accuracy is just as good with one caliber as with the other.

 

[Jyezahn]

It works perfect either way guys, .40 to 9mm (no mod) or 9mm to .40 (slight mod). After its all said and done you will have no problems shooting either caliber through which ever conversion u decide to make.

Noone who had ever converted their Shield to either caliber has ever complained about anything. Even the accuracy is just as good with one caliber as with the other.

I know you're saying that nobody has ever complained about stepping up in caliber conversion, but I can't find any instances where someone has done it, so it makes sense there would be no complaints.

Anyone here actually converted from 9mm to 40cal? I'd like to hear from them regarding how the primer side of the 40cal rd sits against the slide. I know it works when going from 40cal to 9mm because the smaller rd will just slide in. I'm just curious, because I haven't seen a 9mm slide that will accept a 40cal primer side. (not saying they aren't in existence, but that's why I'm asking)