Contact Glock and they will send you a manual for free. You can also download one from the Glock webiste.
.45 ACP
The Glock 21 does fire the .45 ACP, as does the Glock 30. You're probably thinking of the Glock 37, 38, and 39, which fire the .45 GAP cartridge - those cannot fire a .45 ACP.
A glock 45 is a .45 caliber pistol, which fires a 45 caliber round. The glock 10mm fires 10mm rounds, which are .3945 caliber. Which is slightly smaller than the .40 caliber. Both of the two calibers, .45 and 10mm, are the 2 mosst expensive caliber weapons of glock. A 10mm is used mainly for law enforcement. You can fire rapidly with a Glock 10mm and be more accurate than you would with a Glock .45 caliber simply because the glock 10mm will have less recoil than the Glock .45 will. The Glock .45 will most likely do more damage though. Please Correct Me If I Am Wrong. Thanks, Bronson.
They were using the Glock chambered in 45GAP but have just switched and went to the Glock in 45ACP.
There are several models of Glock pistol in .45 calibre. The .45 ACP models include the Glock 21, Glock 30, and Glock 36. The .45 GAP models include the Glock 37, Glock 38, and Glock 39. Factory standard magazine capacities are as follows:Glock 21: 13 roundsGlock 30: 10 roundsGlock 36: 6 roundsGlock 37: 10 roundsGlock 38: 8 roundsGlock 39: 6 rounds
GAP = Glock Automatic Pistol It is a shorter .45 caliber cartridge and loading created by the Glock corporation.
The glock 21 fires the .45 automatic colt pistol (.45acp, or .45 auto) round.
Caliber is .45 GAP (Glock auto pistol)
A Glock 45 is a semi-automatic pistol. Glock pistols are a very popular type of pistol. In particular many law enforcement agencies in the US use them.
"GAP" when referring to Glock refers to a caliber. A few years ago, Glock designed the .45 GAP (which stands for "Glock Auto Pistol" as a way to get a .45 caliber cartridge in a smaller frame gun. It was a failure. There is nothing wrong with the cartridge, but it just doesn't do much the .45 ACP won't do.
For a basic Glock 21, new in box, between $600 - $650.