.45 Colt (a.k.a. .45 Long Colt) is a revolver cartridge that's been around since the black powder days. .45 Automatic Colt Pistol is the round developed by Colt for it's 1911 model and is what most people refer to when they speak of the ".45 caliber". .45 Glock Automatic Pistol is basically a shorter version of the .45 ACP that was designed to fit smaller pistols.wjbn said:This is a Newbie question. I see 45 GAP,ACP and Colt. What is the difference between them?
if you go on some of the "other " forums , some folks get quite proturbed when you refer to the 45 colt as 45 long colt- it's 45 colt in my reloading manuals.