Springfield Armory Saint M-LOK B5 5.56mm NATO 16in Black Semi Automatic Modern Sporting Rifle - 10+1 Rounds - This is the SAINT for the rugged individualist who appreciates the classics. The lightweight mid-length direct gas impingement operating system offers superlative reliability. Top-end B5 Systems furniture combines comfort with ample M-Lok space so you can customize your SAINT to fit your unique personality. The traditional front sight base is both unbreakable and foolproof. A 16in chrome moly vanadium Melonite-coated 1:8in-twist barrel strikes the perfect balance between compact portability and rugged performance.