Unless someone makes a .45 ACP sized .40, I don't see any .40's that are going to make it the long haul without wearing out. The old S&W 4006 would probably hold up, but it's long gone. The .40 S&W is always put in a 9mm sized pistol and that cartridge beats the living crap out of the a pistol that size. So unless they make a pistol with a much heavier slide and a frame beefed up in the right places, I just don't see the .40 making it through all the military tests.
So the .45 ACP seems like it's set for a return.
