Adams Arms is dedicated to furthering the technological capabilities of the AR-15 platform through machining ingenuity, coating processes, and system design and development while maintaining modularity. The Adams Arms proprietary operating system mechanically actuates the bolt carrier externally to the receiver, keeping the internal receiver free from heat and carbon build-up. It's self-cleaning and adjustable and prevents harmonics from transferring to the barrel, which increases accuracy. Adams' Base Model Rifles offer a complete rifle with all the benefits of their piston system in a lightweight, simple package. They feature Adams' signature Voodoo barrels; a modified M4-style handguard and feed ramps; and an A2 pistol grip, flash hider, and 6-position adjustable stock. 1913 Picatinny rail flat top with dry lube internal finish and laser engraved T-markings. Type III Class II Hard-coat anodized receiver. Beveled magwell. 30-round GI aluminum magazine. 1 in 7" twist.