FightLite SCR-16-BKMT: The FightLite SCR (Sport Configurable Rifle) blends the strength, reliability, accuracy and rugged all-weather characteristics of America\'s longest serving infantry rifle with the classic lines of an American Sporter. The SCR features a modern, high-impact polymer buttstock with enhanced ergonomics combined with a free-floating FightLite M-Lok handguard for maximum accessory retention; MIL-STD 1913 flat top upper receiver that accepts most modern optics, night vision and thermal devices; multi-caliber, modular arrangement permits users to instantly change calibers in the field by simply pressing two pins and exchanging one upper receiver assembly for another. Accepts most Modern Sporting Rifle parts and accessories including magazines, upper receivers, barrels, bolts, handguards, sights and optics.