This entry details the AAI 2nd Gen SPIW flechette rifle, a prototype from the 1960s explored by the US military. It highlights the weapon's unique XM-145 flechette ammunition, its complex operational history including trial failures and improvements, and its eventual legacy influencing the ACR program. The analysis is presented with high authority by Ian McCollum of Forgotten Weapons.
This guide details the unique feeding mechanisms of two experimental SPIW program magazines: the Springfield 60-round dual-stack and the AAI XM19 50-round design. It highlights the complex follower systems and innovative constant-force springs used to achieve high capacities in compact designs, as explained by firearms expert Ian McCollum.
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