The AR-15 forward assist, a feature insisted upon by the US Army, was a solution searching for a problem, with the Air Force and designer Eugene Stoner deeming it unnecessary. Despite initial opposition and the Air Force's preference for slick-side receivers, the Army's requirement for a manual bolt-closing device led to the adoption of the plunger-style assist, influenced by experiences with older service rifles. Testing showed Colt's plunger design performed better in adverse conditions than Springfield's alternative.
This video delves into the unique magazine designs for the US Project SPIW program, focusing on the Springfield 1964 and AAI XM19 experimental rifles. It highlights the challenges of high-capacity feeding for flechette rounds, showcasing Springfield's dual-stack 60-round magazine and AAI's innovative 50-round design with constant-force springs. The discussion underscores the program's goal of improving infantry hit probability through advanced ammunition and high rates of fire.
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