S&W M&P 9mm to .40 conversion

[RedSuinit]

Is it as simple as the glocks? Where all you need is the appropriate size barrel with the right length, and then the proper mags?

[56FordGuy]

I'm not familiar with the M&P, but the Glocks can only be converted from .40 to 9mm. A 9mm can't be converted to shoot .40, due to the larger diameter barrel needing a bigger hole in the end of the slide.

I would think the M&P would be the same.

[Guest gw2and4]

Did you mean .40 to 9mm conversion? I've never heard of a pistol converting UP in caliber like 9 to 40...but I have converted my Glock 23 from .40 to 9mm and it works fine with just the drop-in conversion barrel from Lone Wolf Distributors (Lone Wolf Distributors - Main Page) and some Glock 19 9mm mags.

[Smith]

You can only go Down from .40 to 9mm or .357 sig. You can't go from 9mm up. Reason is the hole in the slide where the barrel comes out is not wide enough and most .40 slides are a little heavier for the extra pressure.

[RedSuinit]

I meant from .40 to 9. I currently own a 9 but I like it so much I am looking at investing in a .40, but would like to be able to change it over to a 9 for the cheaper ammo, so that my wife an I could both have one, and we could both be on the range at the same time. Because the .40 ammo is more expensive than 9mm ammo.

[Smith]

Then, yes.

[RedSuinit]

Then, yes.

Thanks!