This rugged Sig Sauer SIG516 5.56 NATO Carbon Fiber rifle is a modern AR-15 that was built to tackle the toughest tactical environments. Features include a short-stroke gas piston system with 4-position gas valve, locking flip-up front and rear sights, integral ambidextrous QD sling mounts, rail adaptable carbon fiber extended forend, carbon fiber fixed A1 length stock, Lancer 30 round L5 magazine, and a two-stage match trigger.