H and R M16A1 Features The H and R M16A1 is built around a 20 4150 Chrome Moly Vanadium pencil-profile barrel with a parkerized finish and chrome lining chambered in 5.56 NATO with a Rifle-length gas system for smooth reliable cycling. The 1/2x28 threaded muzzle wears an authentic A1-style flash hider and the 1:12 twist rate matches the original M16A1 specification for period-correct ballistics. A Carpenter 158 steel bolt carrier with a full-auto profile and staked gas key delivers durable mil-spec function shot after shot. The Rifle-height front sight base and integrated carry-handle rear sight give shooters a fast familiar iron sight picture without needing to add optics. Forged from 7075-T6 aluminum using proprietary NoDak Spud dies the upper and lower receivers are finished in black anodizing for a durable classic appearance true to the original rifle. The M16A1 triangular handguard with heat shields and A1-style pistol grip round out the retro furniture package for an authentic feel in hand. The Retro H&R trigger group includes a flat trigger and retro trigger guard staying faithful to the original design while offering dependable semi-automatic function. Ships with one 20-round magazine making this M16A1 a complete ready-to-shoot retro rifle for collectors and enthusiasts alike. H and R M16A1 Specifications Manufacturer: Harrington & Richardson Model: M16A1 Action: Semi-Automatic Caliber: 5.56 NATO Barrel Length: 20 Barrel Profile: Pencil Twist Rate: 1:12 Thread Pattern: 1/2x28 Capacity: 20 Rounds Sights: Carry Handle Iron Sights Stock: Fixed A1 Finish: Anodized Magazines Included: 1 Available At: GrabAGun