M&P 5.7 Barrel Mod

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eatkins

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I have one 5.7 and it shoots great. I have a friend with a 5.7 and he had a Gun smith cut the threaded part off the barrel. He has not had time to shoot it as of yet because of work. I was thinking of having mine done, anyone have thoughts on doing this?

Ralph
 
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Well, you know what the threaded portion is for. If you don't plan on ever getting a suppressor, then cutting it off is not a big deal. But keep in mind, if you ever want to sell it, you are reducing the resale value, maybe by a lot. Does the threaded portion with thread protector not look the way you want? Not making fun - that's exactly the kind of reason I'd find.
What do you think?
 
GerSan69 said:
Well, you know what the threaded portion is for. If you don't plan on ever getting a suppressor, then cutting it off is not a big deal. But keep in mind, if you ever want to sell it, you are reducing the resale value, maybe by a lot. Does the threaded portion with thread protector not look the way you want? Not making fun - that's exactly the kind of reason I'd find.
What do you think?
Click to expand...

My main concern is, will the gun still cycle like it should, as Paul will not be back for three months I just wanted to know.

To answer your question I will never put a suppressor on the gun. Also I will never sell the gun.
 

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Why do you want the threads removed?? It could impact function depending on the ammo you use. The barrel was made and tested by S&W and it works well, if you start having a problem do not blame S&W.
 
vipermd said:
Why do you want the threads removed?? It could impact function depending on the ammo you use. The barrel was made and tested by S&W and it works well, if you start having a problem do not blame S&W.
Click to expand...

First, I will not use the threaded barrel so there is no need.

Second I would not blame S&W.
 
eatkins said:
My main concern is, will the gun still cycle like it should, as Paul will not be back for three months I just wanted to know.

To answer your question I will never put a suppressor on the gun. Also I will never sell the gun.
Click to expand...

Is that the picture or there's no crown on the barrel after cutting ?
 
You said your friend already did this - I understand it hasn't been shot yet, but have you seen it? How far back from the end of the slide is the end of the barrel? Is it still supported there?
I don't know if aftermarket barrels are available for those yet, but I think I'd be more inclined to wait and get one of those instead of cutting the only barrel you (currently) have.
 
I don't recall which magazine (American Rifleman or American Handgunner) had reviews of the .22 WRM & 5.7 pistols, but there was something in there about the actual barrel being inside a shroud. IIRC, there's something about how gas pressure in the shroud has something to do the how the gun operates. You also have to clean the outside of the barrel & inside of the shroud. I didn't pay a heck of a lot of attention because neither is something I'm going to buy. Again, IIRC, the threads are on the shroud, not the barrel.

With that in mind, I'd certainly wait until your friend gets back and see how his operates and how accurate it is before modifying yours. Once you whack that barrel down, all problems are YOURS, not the factory's.
 
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If it was me, I'd buy the 22WMR version if I didn't want threaded barrel. Would provide justification to purchase both 22WMR and 5.7 versions!

I'd buy a PSA Rock standard w/o threaded barrel before I'd pay some schwanging gunsmith to gnaw off the threads on a S&W. How much was the chop job?
 
The 5.7 is gas operated. The barrel sits inside the "sleeve" and rotates to unlock. There's gas port near the muzzle end.

I don't have a 5.7 but I'd be concerned that shortening the barrel will reduce the distance from the gas port to the muzzle and *may* effect cycling.

The green arrow shows where the gas port is located. If you chop the threads off, you'd end up at the red arrow.


tempo barrel.jpg

If it were me, I'd wait until your friend has a chance to shoot it to make sure it cycles OK.
 
Saudade said:
The 5.7 is gas operated...I don't have a 5.7 but I'd be concerned that shortening the barrel will reduce the distance from the gas port to the muzzle and *may* effect cycling.
Click to expand...
That was my first concern too but a fellow forum member let this schwanging gunsmith gnaw the threads off their M&P 5.7 barrel and test it before I did it to my own. :)
My other concern was that since it’s a pistol, the chamber is part of the barrel length and with a 5.7x28mm being about 1.6” long, it already has only 3.4” of rifling. Taking the 0.6” of threads off the end puts it down to 2.8” and how’s that going to affect stabilization and velocity?

I need to bring the chrono along next time to compare unmodified and modified but it cycles just fine with the three different loads I tried in it; FN SS197SR and my 30gr Varmint Grenade and 55gr plinking reloads. It might be a little louder and the flash a little bigger but it's very difficult to see or feel the difference between the modified and unmodified barrels, and I really think the pistol looks a lot better without the threads sticking out.

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Didn’t want to buy or mount a Holosun on it so while I was at it, I modified the slide to direct mount a Trijicon RMRcc.

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I'm the guy the member snw357 mentions who wanted the barrel & shroud shortened. I have shot my modified gun many rounds since the work was done and I am quite happy with it. Accuracy has not been affected in the least with the FN blue tip ammo that I prefer. Function has not been affected either, except for the following.
I have found that it is necessary to clean the barrel and shroud more often with the modification. If I let it go too long, I start to get failures to fully extract the empty case and failure to chamber a new round which indicates to me that I am building up carbon which slows the action down. So I routinely clean these parts thoroughly and have not had further problems. It is interesting to note that the manual that comes with the gun strongly recommends cleaning every 500 rounds.
Being an elderly guy with arthritic hands, I really like the 5.7 with it's light recoil and I like the look of the gun better without the threaded portion on the muzzle. I'm a happy guy!
- - - Buckspen
 
SSGRock said:
Why not look for a replacement or second barrel.
Click to expand...
Because he and I already have a second barrel?

buckspen said:
I have found that it is necessary to clean the barrel and shroud more often with the modification. If I let it go too long, I start to get failures to fully extract the empty case and failure to chamber a new round which indicates to me that I am building up carbon which slows the action down. So I routinely clean these parts thoroughly and have not had further problems. It is interesting to note that the manual that comes with the gun strongly recommends cleaning every 500 rounds.
Click to expand...
Buckspen is 100% correct. I experienced the same failure, the only failure I might add (and I shoot my reloads).
With the shortened barrel and shroud, I would expect more of the carbon to leave the shorter barrel through the muzzle, not more going through the gas port into the shroud.
Since it's easier to clean when it's fresh, and I expect the pistol to function flawlessly, I clean it after every range session.

Absolutely love this pistol and the Tempo system is a game changer for those who reload.
 
I found a complete 5.7 parts set (all but frame), so I have the extra barrel and shroud if I ever need one. It cost almost as much as a new pistol, but I like to have spares available in time of need. And getting parts from S&W is very difficult these days.
I, too, really like my 5.7 (have two plus the parts kit) and shoot it almost every week in concealed carry/tactical training classes.
- - Buckspen
 
Searching for a threaded barrel

Because of the state I live in (CO) , I had to order the CA compliant M&P 5.7. I accepted the magazine capacity limit as something I just had to deal with, however, I was unpleasantly surprised that my pistol arrived with a factory NON-threaded barrel! :( Does anyone have any suggestion as to where I can buy a threaded barrel? Or for anyone who wants a non-threaded barrel, maybe an exchange can be made?

I did reach out to S&W and they responded with: "this part is not for sale by itself." I imagine this will change some day...

Thanks in advance for any help! :)
 
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