Howard Clarke, representing the Clarke Arms Corporation, submitted this carbine to Aberdeen Proving Grounds in April of 1944 for consideration, despite the M1 Carbine having been in general service for some time. It was a primer-actuated design, and very simple (and thus cheap) to manufacture. It had 70 parts, an 18″ barrel, and weighed 5.17 pounds (without sling or magazine). It was found to have acceptable accuracy and performed well in dust and rain tests, but suffered many malfunctions during endurance testing. The testing board at Aberdeen concluded that the operating mechanism showed promise, but the weapon was not suitable for military use until its flaws were corrected.