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Q: what is the difference between GAP ammo and ACP ammo and 45 auto?
Posted On: 2/9/12 By: Danny Kludt
A: Currently, there are two types of .45 caliber cartridges used in commonly available, new production handguns. They are the .45 ACP (also known as .45 Auto) and the .45 GAP. .45 ACP has been in use for over 100 years and is what the vast majority of .45 caliber pistols are chambered for. .45 GAP was designed by Glock as a cartridge that could be used in a shorter magazine, and thus a smaller frame, while still offering a .45 caliber bullet and decent velocities that could be compared to some .45 ACP loads. The two cartridges are not interchangeable and you should only buy the cartridge type that your firearm has stamped on its barrel.
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