The DS Arms SA58 OSW (Operational Shortening Weapon) is the ultra-compact FAL variant with a 11-inch barrel and para folding stock. As an NFA short-barreled rifle it requires a Form 4 transfer. The OSW was DS Arms' interpretation of the FN CAL/FALO compact configurations used by special operations units. Full-power 7.62x51mm from an 11-inch barrel is ballistically marginal but the platform remains identifiable. Type: Rifle Action: Semi-Automatic Caliber: 7.62x51mm NATO Capacity: 20 Year introduced: 2003, USA Weight: 192 oz Overall length: 31.5" Status: Active Intended use: tactical, collector