The .45 Automatic Colt Pistol round, or .45 ACP as it is commonly known, is fairly controversial. ... 4.25 inch barrel, a reduction of three quarters of an inch over a standard, ...

Bonnie Parker’s Colt .25-caliber pistol taken from her purse shortly after she and Clyde Barrow were killed by lawmen, is up for sale online through RR Auction. Courtesy / RR Auction.

Al Capone’s Colt .25-caliber semi-automatic vest pocket pistol will be among the items included in the American Gangsters, Outlaws and Lawman sale organized by RR Auctions.

Looking at his other famous handguns: the Colt 1903 Hammerless was in .380 ACP, the Colt Woodsman was a .22 LR, and the posthumously completed Hi-Power was, of course, in 9mm. The handguns he created ...