This review delves into the AAI 2nd Gen SPIW flechette rifles, prototypes from 1966-1967 designed to replace traditional rifles with high-velocity flechette ammunition. Despite impressive muzzle velocity (4,585 fps) and a unique primer-activated operating system, the program faced significant reliability and accuracy issues during trials, particularly with mass-produced ammunition. The 1967 model introduced improvements like a barrel radiator to address cook-off problems.
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