M&P 9

[Cfox44]

Can I swap my 9mm barrel to a 40 barrel in my m&p 9 without any upgrades?

 

[Sgt 45]

I believe the answer is no. The other way around, yes.

 

[bikendan]

the only way you can change a M&P 9 to shoot 40, is to replace the entire slide and barrel and mags, as far as i know. not sure if you can use the same spring.

there also is no conversion barrel for such a change.

that's why many of us buy the 40FS, instead of the 9FS.

 

[OKFC05]

The .40 barrel does not fit the 9mm slide.
There are some people who say you can remove metal and make it work, but I have not seen a working "reverse caliber change" on an M&P.

The 9mm barrel is a loose fit in the .40 slide, and seems to work well enough in practice.

 

[WilsonFlyer]

The .40 barrel does not fit the 9mm slide.
There are some people who say you can remove metal and make it work, but I have not seen a working "reverse caliber change" on an M&P.

The 9mm barrel is a loose fit in the .40 slide, and seems to work well enough in practice.

While it does require some filing and modification, there are numerous successful .40 barrel -->9mm frame conversions and they are well documented in this very forum.

While going from a .40 frame and adding a 9mm barrel is fairly easy and pretty common, the other way around is not for the faint of heart, but it's not that hard either, given time, knowledge, and patience.

 

[Cfox44]

Looks like it'll be easier & close to same price to buy one instead thanks for all your advice


Sent from my iPhone using Tapatalk

 

[Rastoff]

Well, not close to the same price, but easier for sure.

As I understand it, you only need to remove a little metal from the hood of the .40 barrel.