Follow the instructions in the owner's manual.
You can get a manual from Colt
You can request a manual from Colt.
Ask a gunsmith for help
check out: http://stevespages.com/page7b.htm
Here is a good page on how to field strip and clean the colt 1911 pistol. http://www.bobtuley.com/45/magazine1.htm
If you mean the standard Caliber of a 1911 model colt pistol,then this was chambered in the caliber .45ACP.
Automatic Colt Pistol. Colt invented the .45 Auto and thus had the right to name it.
Caliber .45 Automatic Colt Pistol.
Rifle or pistol?
22 caliber ammo
The caliber of this weapon is .45 ACP, or it's full name is .45 Automatic Colt Pistol.
1911