“Carbine” Williams.2 Despite its notable improvements, the Service Model ACE was not an overwhelming success either, with sales totaling around 13,500, a couple of thousand better than the original Ace. Both used the new floating chamber designed and patented by David M. 22 LR conversion unit, so owners could practice shooting or go plinking with the same handgun.1 The ACE models used 1911-style magazines that carried 10 rounds of. At the same time Colt’s began offering a. The 4.75-inch barreled 1931 to 1941 design was not one of Colt’s greater success stories, but the idea proved was well worth pursuing with an improved model appearing in 1937 under the name Service Model Ace, which employed a new adjustable rear sight, a 5-inch barrel, and a floating chamber device mitigating the issues that had plagued the original 1931 design. What the original Ace didn’t have was sufficient power to consistently operate the heavy slide with.
![colt 1911 a1 rail gun 22lr colt 1911 a1 rail gun 22lr](https://www.vnwetteren-online.be/2004-tm_thickbox_default/22lr-colt-government-1911-a1-rail-gun.jpg)
45 with the small thumb safety (still in use at that time), arched mainspring housing and serrated slide release. The right side bore the standard Model 1911 patent dates and marking and in all other respects appeared to be a Government Model.
![colt 1911 a1 rail gun 22lr colt 1911 a1 rail gun 22lr](https://cdn.rockislandauction.com/dev_cdn/2021/895.jpg)
It was called the Colt Ace, and the inspired moniker was boldly stamped within a horizontal diamond on the left side of the slide. It was way back in 1931 when Colt’s introduced the first Government Model chambered in.