The Springfield Saint 5.56mm 16″ M-Lok AR-15 Rifle, B5 is lightweight mid-length direct gas impingement operating system that 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 16″ chrome moly vanadium Melonite-coated 1:8″-twist barrel strikes the perfect balance between compact portability and rugged performance.