The Colt 1911 A1 Rail Gun is the modern combat version of the legendary Colt 1911 handgun. It includes low profile combat sights, beavertail safety, and an accessory rail under the barrel. The Colt Government 1911 A1 Rail Gun Semi-Automatic Pistol in .22 L.R. is manufactured exclusively by Walther under license from Colt. It is the only genuine Colt tactical rimfire replica available in the world.