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lbwar15 07-10-2012 04:23 PM

M&P conversion?
Can you convert an M&P .40 into .357 sig and 9mm quickly and easily like you can a glock 22 or 23?

Gone_South 07-15-2012 01:06 AM

I dont know but I would like to know as well. Looking into a .40 but converting into a 9 for range savings is a nice thought.

Gone_South 07-15-2012 02:13 PM

After doing some searches it appears you can. I am posting from my phone so I'm not sure how to post links. I did a general search of .40 to 9 mm & found some hits.

lbwar15 07-16-2012 01:57 PM

I should have done that to begone with.

tbone1964 08-22-2012 02:08 AM

to convert from a.40 to 9 mm you will need new mags in 9mm for reliability and a new barrel.. thats it.. if you can find a stock M&P 9mm barrel that will work as the outside diameter of the forty and nine are the same, the bore size is just different, if not a good barrel from storm lake will work as well.

Corndork2 08-22-2012 10:06 PM


Originally Posted by lbwar15 (Post 865674)
Can you convert an M&P .40 into .357 sig and 9mm quickly and easily like you can a glock 22 or 23?


I have a M&P .40 Full size. The Magazines fit .40S&W and .357SIG. I bought a barrel from S&W for 75.00. It drops directly in, and uses the same recoil spring. Two guns in one :)

You could also look at aftermarket barrels from Storm Lake. They come in stainless, can be ported, or threaded, depending on your application.

CFinnley 08-24-2012 04:12 AM

I just bought me a m&p 45. can it be converted to a 9 as easily as a .40?

Corndork2 08-24-2012 04:45 PM

I believe the .45 has a slightly larger frame than the 9mm, .40S&W, .357SIG variants. The head diameter would also be a big change in that case. I do not think it can be converted as easily... but thats not to say it totally cannot be done. The 9mm, .40S&W, .357SIG variants are easily interchangable.

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