Quote:
Originally Posted by snowman.45
Correct me if I'm wrong, but I understood that the breech face and barrel hood are the same size on the 9mm/.40/.357 Sig. I also understood the outer diameter of the barrels to be the same. If so, can you not put a .40/.357 barrel in a 9mm?
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Depends on the gun from what I understand, you can do some drop in changes with Glocks and M&Ps but you can't go up in size, only down. i.e. 40/.357 to 9mm.