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Discussion Starter #1 (Edited)
Hey Guys,

I have a M&P 2.0 Compact 4" and I was wondering if mechanically would there be any concern with using a 4.25" (model not OAL of the barrel) threaded barrel in mine? I highly doubt the breech face or any internal workings would differ from the 4" too the 4.25" model besides the OAL of the barrel?

I noticed on SW website you can get a Compact (15rd cap.) model with a threaded barrel which is spec'd at 4.625" length... Wouldn't this methodology apply to what I am questioning?

If I am way off base please let me know! lol.

Thanks
 

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I wouldn't say off base but I don't know the answer.

I do know that Apex makes threaded barrels for 4" 2.0's. They are drop in and mine fits with less play than the OEM barrel. They are $199 but appear to be currently out of stock at Apex. You might find one at a reseller like Midway or Brownells.

If any 3.6 M2.0 owners are reading this I see that Apex now lists threaded barrels for them. Same price and appeared to be in stock.
 

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Discussion Starter #3
Thanks Chuck,

I actually already have a drop in barrel, issue was it was a impulse late night buy and I selected the wrong length.... lol.

If I cannot get this one to work as-is (safely of course) without modifications then I will just post it for sale on the forums for someone else to use!
 

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Hello Tex,
I have used a S&W 4.25" .357 SIG barrel in my 4" M&P40 2.0 with no issues. I had the same question and my conclusion was if you can run a longer threaded barrel in a slide then a slightly longer non threaded barrel should be okay. I've used the 4.25" .357 SIG barrel in both my M&P40 4.25" and M&P40 2.0 4.0". I've experienced no issues at all.
 

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I have an M&P 2.0 Compact 40 and purchased a factory FS 357 Sig barrel and a Storm Lake FS 9mm conversion barrel as well. I had my local smith turn down both barrels and add an 11 degree crown. Both dropped in, functioned 100% and provided the similar accuracy as the 40 barrel.
 

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Interesting post. I wanted an M&P 40 Compact 4 inch with a KKM 357 SIG barrel. KKM does not make a barrel for the 4 inch, only the full size 4.25 inch. I asked KKM if it work work in the 4 inch and they said maybe, but it probably would be a few thousandths smaller in diameter at the muzzle end. So, I bought a a new 4 inch compact and a full size 4.25 inch. Ordered the KKM barrel cut to 4.5 inches. Swapped the slides and frames. Now I have a compact (13 round magazine) frame with a 4.25" slide and a 357 SIG barrel that sticks out only a quarter in longer than the stock barrel. I have not shot it yet, but it appears to function fine. In retrospect, I should have bought the 4 inch gun first, then ordered a barrel for the full size and tried it before buying the full size gun. However, I don't mind the 1/4 inch longer slide as the grip is the more important feature when it coms to carrying concealed. I also did the same thin with my 40 Shield with green laser and thumb safety. I wanted the same gun with the 4 inch top end. S&W does not make them that way so I bought the performance center 4 inch Optic Ready Shield and put the top end on my original frame. I now have a fully functional 4 inch 40 Shield with thumb safety and integrated green laser. Before I did this, I called S&W customer service and spoke with a woman rep who was obviously short on knowledge and she told me she did not think it would work. Turns out she was dead wrong as it shoots fine, and I now have the gun with the features I want.

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