Can anyone tell me if the barrels of the S&W M&P40 and M&P357 sig are interchangeable and by this I mean the stock S&W barrels. I have the M&P40 and the magazine and bolt face are a match for the 357 sig, now if the Outside Diameter of the two barrels is the same I should be able to just swap the barrels to shot the other caliber. Well maybe change the spring as well, I'll have to look into that.
Thanks for your input.
Rob
Thanks for your input.
Rob


















































