The Colt Service Model Ace was designed to offer an inexpensive low-recoil alternative to the full size 45ACP Government Model. The Service Model Ace carried the same weight and dimensions as a full size 45 pistol.
The Service Model Ace incorporates a floating chamber which was invented by David M. "Carbine" Williams of Godwin, NC. By design of the floating chamber will quadruple the normal recoil power of the .22 Caliber cartridge and adequately simulating the recoil action of the .45.
The Pre-War Service Model Ace were numbered from SM1 to SM13803. The majority of which were procured by the US armed forces.