Since buying an M&P22 pistol, I got the M&P bug. I now have the M&P9 full size, the VTAC 9mm, and now an M&P15.

I have a Glock 20SF (10mm) with a Lone Wolf 6" barrel and I like it a lot.

So the question is, and I searched this forum and can't find an answer, can a barrel for an M&P Pro function in my full size??

Thanks for any help.

If I understand correctly, you want to install a 5" bbl in your 4¼ pistol. I am guessing it will not be right. I just looked at my 4¼ and there is a rebated diameter. That is, the front ½ inch (length) is larger diameter than the rest of the bbl. Assuming the PRO bbl is that way the bbl would be a loose fit in the slide. There are some suppressor barrels that will definitely work in your gun. In fact, you can buy a suppressor ready pistol kit with both barrels. I do not know the lenth of the suppressor barrels, but they stick out the front of the slide.

You are correct, I wanted to use a 5" barrel in my full size (4.25") M&P.

Yes there are threaded barrels for all M&P models. I have seen 5" barrels in 4.5" guns but they looked to be aftermarket barrels probably made for the purpose... they were raw stainless.

I slipped a 5" Pro barrel into my 4.25" gun, and it is a loose fit at the front. Jaykellogg is right that the stock M&P barrels have a larger section at the front, so they only correctly fit their own slide length.

You need to look aftermarket.

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Science plus Art

My thoughts are to suggest you buy a M&P Pro in 5". That way you have the increased barrel length AND increased sight radius. I know the 1911 guys like the long slide version for the increased sight radius. Midway has barrels for your 4¼ pistol that are 4.95" long and ported for about $150. I can see where in a 10mm pistol there might be a benefit to increased barrel length, but in a 9mm, I cannot think of much of an advantage (If it isn't ported).

My LGS can't hardly get a Pro in 9mm, he gets the 40SW all the time. But I'm sure I'll find one eventually.

Grab-A-Gun has some back in stock.

You can still find factory threaded barrels. Just need to look around the auction sites. I picked mine up new for $125
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