The .45 GAP was designed for use in a gun platform sized for the 9mm. Glock was being pressed to make a .45 pistol, but they didn't want to have to do a total redesign of their 9/40 platform, hence the .45 GAP (Glock Automatic Pistol). Eventually, they gave up on that idea and brought out a true .45 ACP.
The .45 GAP can be fired in the standard 1911, but not reliably. I used a lighter recoil spring and it worked well enough for range fun, but I would not depend on it for serious purposes.
Jim
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