The Springfield Armory's SAINT AR-15 rifle includes the Accu-Tite tension system that eliminates movement between the upper and lower receivers, a Carpenter 158 bolt carrier group, shot-peened, HPT/MPI inspected bolt, Melonite finished CMV barrel inside and out, and nickel-boron coated trigger components. SAINT rifles feature slim M-LOK compatible handguards from Bravo Company, with an internal aluminum heat shield. This Spring Armory AR15 features a pinned, picatinny railed gas block and includes an SA low-profile flip-up front sight. The SAINT also includes a low-profile, dual aperture flip-up rear sight with A 1/2 minute of angle windage adjustments. Mfg: Springfield Armory