Best to ask a gunsmith for help.
c4
Caliber .45 Automatic Colt Pistol.
Automatic Colt Pistol. Colt invented the .45 Auto and thus had the right to name it.
The caliber of this weapon is .45 ACP, or it's full name is .45 Automatic Colt Pistol.
It could be any pistol chambered for one of the several handgun calibers in the .45 family. The most famous .45 handguns are actually chambered for different rounds. The Colt model 1873 "Peacemaker" was offered in .45 Colt or "Long Colt" caliber, among other calibers. And the famous Colt model 1911 was sold in a caliber called .45 ACP (automatic Colt pistol). The .45 ACP is not interchangeable with the .45 Long Colt, but they both fire big heavy bullets at similar velocities.
Go to Colt's web site and request an owner's manual.
go to: http://stevespages.com/page7b.htm
Request an owner's manual from the manufacturer. Not all 1911 types disassemble the same.
Good detail strip and reassembly videos for series 80 1911's and some good tricks to put those tricky parts back in!
Blue Book of Gun Values
Colt has never made a 45/410 pistol
Answer The Colt .45 caliber automatic pistol was accepted as the standard side arm of the US Army and became identified as the Model 1911 Pistol. The bullet developed for use in this new design of automatic pistol was called the .45 ACP or the .45 Automatic Colt Pistol cartridge. It stands for "Automatic Colt Pistol" because it was adopted for the Colt 1911 only by the US army.You get many variants the most prolific being the .45 GAP for glock handguns.It's patented I believe.