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The Olin/Winchester FAL is an experimental double-barreled 5.56mm automatic rifle created for the U.S. Army's Project SALVO in the 1950s. Developed in hopes of increasing the hit probability of soldiers in combat, the Salvo Rifle was designed by Stefan K. Janson, who had previously created the Enfield EM-2 bullpup rifle for the British Army. The Salvo Rifle design is roughly a pair of FN FAL rifles grafted together, sharing a single gas system. The use of the FAL action is ironic given that only a few years earlier, Janson's EM-2 design had lost out to a FAL variant, the L1A1 SLR, for British military adoption. The Salvo Rifle was chambered for the experimental 5.56mm T65 Duplex cartridge, based on a long-necked variant of the 7.62 x 51 mm NATO cartridge case loaded with a pair of conventional projectiles. Two variants of the duplex cartridge existed: one fired two 35 grain projectiles at 3,505 fps, while the other fired a pair of 41 grain bullets at 3,250 fps. With its two barrels each firing a duplex cartridge, the Salvo Rifle would effectively launch four projectiles with every press of the trigger. However, this proved to be the Salvo Rifle's downfall as the recoil of firing two duplex cartridges at the same time exceeded that of the M1 Garand.

An example of the Salvo Rifle is currently held in the collection of the Springfield Armory Museum.

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