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  #1  
Old 03-12-2012, 07:02 PM
blkpitbull blkpitbull is offline
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Default longer barrel fit into compact?

I searched and didn't find an answer.
I have a 9c, can a longer barrel from the "bigger" m&p 9's be used in my gun?
Thanks
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Old 03-12-2012, 09:18 PM
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Houdini1953 Houdini1953 is offline
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Well I am not really sure about that but it is probably possible but not really makes much sense to have a barrel protruding from the end of your gun but if that is what you want then try it out and let us know how it works and looks!
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Old 03-12-2012, 10:43 PM
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Lol, I do not intend to carry it with the longer barrel installed. I was curious and would be cool to use for longer range shots and to maybe use in competitions, if allowed.
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Old 03-14-2012, 09:10 PM
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FWIW, I don't know about a standard barrel but S&W said the full size threaded barrel could not fit and function properly on a compact when they were offering them from the factory. This was both for the 9mm and 45 M&P.

Back in ancient times, (1970s & 1980's) some folks would use a five inch government barrel in Commander size guns for the extra velocity. It worked pretty well in the 1911s but most thought it just looked funny and the concept did not catch on.

Last edited by akviper; 03-14-2012 at 09:12 PM.
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Old 03-14-2012, 10:48 PM
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Quote:
Originally Posted by akviper View Post
FWIW, I don't know about a standard barrel but S&W said the full size threaded barrel could not fit and function properly on a compact when they were offering them from the factory. This was both for the 9mm and 45 M&P.

Back in ancient times, (1970s & 1980's) some folks would use a five inch government barrel in Commander size guns for the extra velocity. It worked pretty well in the 1911s but most thought it just looked funny and the concept did not catch on.
Thank you for your reply.....I am just interested in it to get full size velocity and better accuracy at longer ranges...thanks
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Old 03-15-2012, 02:52 PM
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I would think there would be an aiming problem.
If you look at the forward end of your barrel you will see that it is a slightly wider diameter for the last 3rd of an inch or so. I assume (but don't know for sure) that this acts as a guide bushing in some way. If you used a longer barrel, the "bushing" area would be forward of the end of the slide, resulting in the barrel pointing further down.

That is really the only issue I can see.

As to why someone may want to do this... my guess would be to thread the barrel.
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Old 03-15-2012, 03:39 PM
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Quote:
Originally Posted by g_conway View Post
I would think there would be an aiming problem.
If you look at the forward end of your barrel you will see that it is a slightly wider diameter for the last 3rd of an inch or so. I assume (but don't know for sure) that this acts as a guide bushing in some way. If you used a longer barrel, the "bushing" area would be forward of the end of the slide, resulting in the barrel pointing further down.

That is really the only issue I can see.

As to why someone may want to do this... my guess would be to thread the barrel.
I have a full size and compact .357 Sig. The full size barrel fits and seems to lock up and function like it should. I've not shot it that way but I'm quite confident it would work.

Regarding the above post that I quoted. The end of my full size barrel is .563" while the remaining section is .555". That leaves a difference of .008". If you divide that by 2 allowing for half of the difference for the top and half for the bottom in relation to the center of the bore, from what I figure the barrel would be pointing .004" lower than it would if the larger portion was sitting within the end of the slide.
I doubt that would invoke any aiming issues at "up close and personal" self defense distances. It may affect longer shots slightly, however.
This is speaking for factory barrels. Other barrel makers may make a longer barrel that is a consistent diameter. I have no clue.
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Old 03-17-2012, 04:02 PM
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Quote:
Originally Posted by Imshootin View Post
I have a full size and compact .357 Sig. The full size barrel fits and seems to lock up and function like it should. I've not shot it that way but I'm quite confident it would work.

Regarding the above post that I quoted. The end of my full size barrel is .563" while the remaining section is .555". That leaves a difference of .008". If you divide that by 2 allowing for half of the difference for the top and half for the bottom in relation to the center of the bore, from what I figure the barrel would be pointing .004" lower than it would if the larger portion was sitting within the end of the slide.
I doubt that would invoke any aiming issues at "up close and personal" self defense distances. It may affect longer shots slightly, however.
This is speaking for factory barrels. Other barrel makers may make a longer barrel that is a consistent diameter. I have no clue.
Thanks for the follow-up detail. My gun is for target / IDPA and SD. IMO you are correct re SD. At those ranges it's more of a point and shoot.

Since you seem to have more of a grip on this than me, let me ask a followup question...

It's obvious that the barrel tip rises within the slide upon firing. Do you think the addidional movement is even a factor?
While the slide itself is not really moving until after the bullet has left the barrel, do you think the barrel is starting to rise prior to the bullet exit?
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Old 03-17-2012, 07:23 PM
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Quote:
Originally Posted by g_conway View Post
Thanks for the follow-up detail. My gun is for target / IDPA and SD. IMO you are correct re SD. At those ranges it's more of a point and shoot.

Since you seem to have more of a grip on this than me, let me ask a followup question...

It's obvious that the barrel tip rises within the slide upon firing. Do you think the addidional movement is even a factor?
While the slide itself is not really moving until after the bullet has left the barrel, do you think the barrel is starting to rise prior to the bullet exit?
Since the barrel and slide have to be in lock up to get any kind of consistency while firing, my feeling is that if the slide hasn't started moving, the barrel shouldn't have moved either. If the barrel's moving before the slide starts to move, I'd say we have a lock up problem and consistency would not take place.
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Old 03-18-2012, 12:48 AM
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Thanks for the good replies, so the answer is that a full size barrel will fit, and lock up correctly. Thanks
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Old 03-18-2012, 09:08 AM
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Quote:
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Thanks for the good replies, so the answer is that a full size barrel will fit, and lock up correctly. Thanks
That's not quite what my previous post said but if you want to interpret it that way it's up to you.
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Old 03-18-2012, 09:16 AM
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Quote:
Originally Posted by Imshootin View Post
I have a full size and compact .357 Sig. The full size barrel fits and seems to lock up and function like it should. I've not shot it that way but I'm quite confident it would work.
I took this as a yes, since you said it seemed to lock up as it should and were quite confident it would work. So which is it?
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Old 03-18-2012, 09:31 AM
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On mine, all looks fine as far as checking things in a static situation. The barrel is locked up, the barrel rests in the bottom of the slide opening same as the short barrel with no detectable vertical movement.
So in reply to your statement, "so the answer is that a full size barrel will fit, and lock up correctly" my answer is it appears so in a static situation.
I'm considering a range trip today (depending on the weather) and if I go, I'll take my .357 compact along with my full size .357 and .40 barrels and try them both out. I'll let you know my results. How's that sound?
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Old 03-18-2012, 12:42 PM
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Quote:
Originally Posted by Imshootin View Post
On mine, all looks fine as far as checking things in a static situation. The barrel is locked up, the barrel rests in the bottom of the slide opening same as the short barrel with no detectable vertical movement.
So in reply to your statement, "so the answer is that a full size barrel will fit, and lock up correctly" my answer is it appears so in a static situation.
I'm considering a range trip today (depending on the weather) and if I go, I'll take my .357 compact along with my full size .357 and .40 barrels and try them both out. I'll let you know my results. How's that sound?
That sounds awesome....thanks for your help....
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Old 03-18-2012, 08:23 PM
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I did make it to the range today but went to an indoor range as they were threatening rain. I had 3 other guns I needed to shoot so I had to rush the M&P shooting into one mag each through my full size barrels (.357 & .40) at the end of my hour. Both functioned fine. Both were within a 4" grouping though the .40 rendered half the mag within a 2" bullseye. This was at a 7-8 yard self defense distance.
Wish I could give you more but as I said, it was a rushed couple mags and I was slightly fatigued from shooting a couple of magnum revolvers.
One thing to think about. Usually, when one is shooting a gun with a longer barrel they are also benefiting from a longer slide which gives them a longer sight radius.
A longer sight radius is what will give you better accuracy at longer distances more so than a longer barrel with a shorter sight radius.
Hope this helps.

Last edited by Imshootin; 03-18-2012 at 08:39 PM.
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