Barrel • 13.7" Barrel, 1:7 twist, MPI (Magnetic Particle Inspected) & HPT (High-Pressure • Tested) Gas Journal: .750" diameter with a machined dimple for secure gas block installation • Caliber: 5.56 NATO • Steel: 4150 Cr-V (Chrome Moly Vanadium per MIL-B-11595E) • Finish: QPQ (Quench Polish Quench) Corrosion Resistant • Extension: QPQ coated M4 Feed Ramp Extension • Gas Port: .0785” Midlength Direct Impingement Gas System Lower Receiver • Material: Mil-Spec 7075-T6 aluminum • Finish: Anodized to Mil-Spec MIL-A-8625F, Type III, Class 2 • Features: Safe, Fire, and Full Auto pictograms, low shelf, auto pocket cut • Buffer System: Made from 7075-T6 aluminum with rolled threads, dry film lubed, 6 positions, secured with MilSpec castle nut (38ft/lbs torque value) and steel end plate staked in 2 positions. Action spring made from passivated 17-7 spring steel, HBuffer (3.8oz) with solid tungsten weight and milspec polyether bumper material. • Fire Control Group: Trigger with consistent 5.5 lb pull, full power 17-7 steel springs, nickel Teflon coated components, stainless steel/ QPQ fire control pins for durability and corrosion resistance. • Safety Selector: Ambidextrous, machined from 8620 steel with stainless steel QPQ finished detent for extended/ corrosion resistant service life. • Grip: Magpul MOE MAG415 secured with combo-drive grip screw (3/16” hex/ Flathead) installed with low strength threadlocker for anti-galling and security. Combo drive permits field level access with common flathead, and while inner 3/16” hex drive prevents possibility of stripped head. • Stock: Magpul DT Stock MAG1377 Upper Receiver • Material: Mil-Spec 7075-T6 aluminum. • Finish: Anodized to Mil-Spec MIL-A-8625F, Type III, Class 2. • Features: Engraved T-Marks, dry film lubed carrier bore, machined to accept stainless steel alignment dowel for precision handguard alignment, undersized threaded bore for snug fit over barrel extension, oversized lugs for improved upper/lower receiver fitment. • Gas Block: Lo-Pro, made from 4140 Steel, nitride treated, knurled head set screws degreased, torqued to 25 in/lbs and secured with high temperature thread locker. • Gas Tube: Melonite treated 304 Stainless Steel, secured with stainless steel coil pin • Ambidextrous charging handle machined from 7075-T6 Billet with serrated lever texture for positive grip, levers secured to charging handle body with high strength spiral pins for durability and reliability, charging handle body features “high shelf” integral ledge at the rear of the upper receiver for escaping gas mitigation • Muzzle Device: Mil-Spec A2 Flash Hider • Sights: MAGPUL MBUS3 Front and Rear flip-up backup sights
