Springfield STV916556B: Springfield\'s Saint Victor is the ideal refinement of the time-tested AR-15 design and represents everything that a defensive carbine should be. It features extra-tough, forged aircraft-grade 7075 T6 aluminum upper and lower receivers joined using the Accu-Tite system and Type III hard coat anodized finish. It utilizes a free-float M-Lok handguard, mid-length direct impingement gas system paired with a heavy tungsten buffer, the Saint also has an M16 bolt carrier group machined from Carpenter 158 steel, shot-peened, and magnetic particle inspected. The 16\" Chrome Moly Vanadium barrel is treated with Melonite and has a 1:8\" twist rate for complete ammunition flexibility. The optic-ready out of the box, the flat-top receiver is topped with Springfield Armory\'s low profile flip-up dual aperture sights with 1/2 MOA windage adjustment capability. The Bravo Mod 2 6-position buttstock is rattle-free with positive cheek weld areas, a rubber butt plate, and one fixed and two QD sling attachment points.