.45 Auto

1. Slang "catch all" term used to describe any semi automatic pistol using .45 Automatic Colt Pistol (ACP), ammunition.

2. Slang word used to describe any of the various M1911-type pistols.

Colt M1911A1, Springfield Armory TRP, Heckler & Koch Mk23 SOCOM, Glock 36, SIG P220, Ruger P90.