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View Full Version : converting m&p40 with oem barrel


shawn530
09-12-2012, 7:06 PM
I have A m&p40 also a 9mm oem barrel can i use tha tplus the 9mm mag to convert it to shoot 9mm or does it have to be one of the stormlake barrels?

scglock
09-12-2012, 7:31 PM
Ive never tried but I have a feeling the 40 barrel is a different diameter than the 9 so you can't just drop it in. At least that's how it works for glocks...

Rattlehead
09-12-2012, 7:35 PM
I use a S&W M&P 9mm barrel in my S&W M&P 40 slide, it is a drop in.

There is a small amount of excess space on the left and right side of the breech face area of the barrel, however I haven't had any issues as of yet.

BajaJames83
09-12-2012, 7:37 PM
Its drop in I've done it for thousands of 9mm rounds now. You can even use the 40 mags but they feed a little different

Tjfearl
09-12-2012, 7:46 PM
Its drop in I've done it for thousands of 9mm rounds now. You can even use the 40 mags but they feed a little different

I just went ahead and bought 9mm mags for mine. I tried using my 40 mags, but the spring and follower fowled up. I have the stock 9mm barrel for my fullsize and compact m&p. Many rounds through both and never had a problem. You will not regret spending $70 instead of $140

shawn530
09-12-2012, 8:35 PM
awesome thanks for the info ill try see if i can find some 9mm mags now i know the 40sw mags work with the 357 but don't feel like buying that barrel too

Tjfearl
09-13-2012, 12:43 AM
www.44mag.com

Sam
09-13-2012, 8:54 AM
Why not try a Calguns merchant? I've had great transactions with Exile Machine.

Tjfearl
09-13-2012, 2:54 PM
Exile is good if you want rebuilds or cali legal stuff, but they rarely have m&p 10 rd full size mags in stock. And they are more expensive than 44mag.com.

kauaibuilt
09-13-2012, 9:21 PM
What they said - works great. Hundreds of rounds through my S&W stock 9mm barrel converted .40 (with 9mm mags) and the only issues Ive had have been ammo related (dented cases/rims on reloads that I didnt catch before loading it up).

ArkinDomino
09-14-2012, 2:14 AM
I just recently bought an OEM 9mm barrel for my compact .40 and some mags and it works perfectly.

scglock
09-14-2012, 2:32 AM
Guess I was wrong! Does it work the other way around? 9 to 40?

Tjfearl
09-14-2012, 2:52 AM
no because the breech face on the 9mm slide is too small to accept .40 or .357 barrels