If by 45 automatic pistol you mean the 1911 Colt, then John Browning developed this design and the cartridge it uses between 1900 and 1904, producing his first prototype for testing in 1904. It was tested and modified, then adopted for service use by the United States in 1911, hence its designation as the M1911 Automatic Pistol. The design was further modified to create the M1911A1, which includes the grip safety.
Automatic Colt Pistol. Colt invented the .45 Auto and thus had the right to name it.
Automatic Colt Pistol
'ACP' means Automatic Colt Pistol. A 1911, for example, would chamber a .45 ACP cartridge.
.45 ACP means Automatic Colt Pistol. It IS .45 Auto.
Caliber .45 Automatic Colt Pistol.
Glock Automatic 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.
$400 new
15-45 USD
john M Browning.
No. The .45 Automatic Colt Pistol (ACP) cartridge is longer the the .45 Glock Automatic Pistol (GAP) cartridge. Since they headspace on the MOUTH of the cartridge case, they cannot be interchanged.
ACP stand for Automatic Colt Pistol