Colt Service Model Ace: Carbine Williams Makes a .22 1911
The Colt Service Model Ace is a .22 LR conversion of the 1911, featuring a unique 'floating chamber' mechanism developed by David Marshall Williams. This design allowed for reliable cycling of the slide using low-power .22 LR ammunition, making it an effective and cost-efficient military trainer. The pistol shares external dimensions with the 1911 but has significant internal modifications, including a fixed barrel and a lightened slide.









