What does .45acp mean?

.45acp in Community Dictionary

ACP = car Colt PistolThe popular, and common, quality, used in handguns of wide types. The .45acp cartridge ended up being chambered inside renowned Colt M1911A1 handgun, used by us infantry during WWII..45acp can be used right now, for such guns such as the H&K Mark 23 SOCOM, and H&K's USP's. .45acp is even the caliber for Tommygun used in WWII, and today it really is used in H&K's UMP submachine weapon. by Harvey MaudlinReport definition
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