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GAP = Glock Automatic Pistol
The .45 GAP is the same diameter as the .45 ACP pistol cartridge, but is shorter than the .45 ACP â€" and even slightly shorter than the overall length of the 9x19mm Parabellum and .40 S&W â€" and uses a small-pistol primer as found in smaller calibers such as the 9 mm Para, instead of the large-pistol primer as found in most commercial loadings of the .45 ACP (a few manufacturers occasionally use small-pistol primers on some of their .45 ACP offerings).
ACP = Automatic Colt Pistol
The .45 ACP (11.43x23mm Automatic Colt Pistol) is a rimless pistol cartridge designed by firearms designer John Browning in 1904, for use in his prototype Colt semi-automatic .45 pistolâ€"a design which evolved into the M1911 pistol adopted by the U.S. Army in 1911.

The .45 ACP would become one of the most successful cartridges of all time, among both military and civilian users. It has been used in innumerable handguns and submachine guns since its introduction.
.45 AUTO = synonymous with .45 ACP

You can get Glocks chambered for .45 GAP or for .45 ACP, amongst others.
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