Production of the CAR-15 Commando ended in 1970. military as American ground force involvement in the Vietnam War was gradually winding down. Both recommendations were declined by the U.S. There were also recommendations for a 29-month $635,000 research and development program. Problems with range, accuracy, barrel fouling, and usage of tracer bullets continued to plague the XM177 series, but Colt estimated that it would take a six-month $400,000 program to do a complete ballistic and kinematic study. According to John Plaster and other sources, the lack of 30-round magazines continued to be problematic and SOG operators resorted to pooling their personal resources and purchasing the larger capacity magazines on the civilian U.S. Sources debate whether or not this was a Colt Model 630 or Model 649.
The Air Force adopted a similar model without the forward assist feature as the GAU-5A/A. Delivery was completed by the end of September 1967. In April 1967, the Army purchased 510 Model 629 Commandos for use by troops assigned to the Military Assistance Command, Vietnam Studies and Observations Group (MACV-SOG), and designated them XM177E2.
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