I highly recommend you buy snap caps, yes i know you must dry fire the XD upon disassmbly, however the XD has a roll pin through the top of the slide that retains the striker assembly. Too much dry firing can damage that pin, i know cuz i did it, bunch of dry fires and my first 50 rounds box of ammo and the pin was already broke, split right down the middle. Theres several places that offer upgraded Striker Retainer Pins, go to pistolgear.com and pick up some, along with a roll pin punch to install. The pins are only a couple bucks, a cheap investment for something that IS going to break eventually.
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.
You can fire a .45 ACP cartridge through a .45 ACP pistol - and only a .45 ACP pistol. The various .45 cartridges (.45 ACP, .45 Long Colt, .45 GAP, etc.) are not interchangeable with each other.
.45 ACP
Aside from the uncommon .45 GAP chambered Glocks, yes. Check the marking on your barrel for the .45 ACP marking.
the pistol was made by Springfield in 1914. If the slide read 'colt' it means someone put a colt slide on a springfield 45 frame. Not unusual.
.22, 9mm, 45 ACP are among them.
ACP means Automatic Colt Pistol. .45 ACP and .45 Auto are the same cartridge. .45 Colt and .45 Auto Rim are a revolver cartridge. .45 GAP (Glock Auto Pistol) is a shorter round than the ACP, and does not interchange with it.
ACP stand for Automatic Colt Pistol
.45 ACP means Automatic Colt Pistol. It IS .45 Auto.
No. The 45 ACP (which means 45 Auto) cannot use the .45 GAP or the .45 Magnum.
Both. .45 Auto and .45 ACP are the same round.
If it's chambered for the .45 ACP cartridge, yes.