The BATTLEARMS AUTHORITY series of firearms are designed from the ground up and purpose-built as the next generation AR-15. The heart of the rifle is the billet BAD556 7075-T6 aircraft grade aluminum receiver with integral ambidextrous controls and free-float rail handguard with M-LOK attachment points at 3, 6, and 9 o'clock positions. At 12 o'clock is a full-length Picatinny accessory rail with our signature notch cut matching the upper receiver. Every firearm is equipped with a 4150 chrome-moly steel black nitride barrel for durability and accuracy. Each barrel is individually head-spaced with matching 9310 steel bolt and 8620 black nitride carrier for ultimate reliability and ease of cleaning. Rifle models utilize a mid-length gas system for reliable and smooth cycling action while reducing recoil and minimizing wear.Features: Receiver Model: BAD556-AMBI (Billet) Type: Semi-Auto rifle Caliber: .223/5.56X45 Muzzle Thread: 1/2x28 TPI Rail Length: 15in WORKHORSE MLOK Freefloat Handguard Gas System: Mid Length Barrel Length: 16in Barrel Twist Rate: 1:7T Barrel Profile/Finish/Material: Medium Profile Black Nitride 4150CM .750 Diameter Gas Block Journal Overall Length: 36.75in (933.45mm) Collapsed Length: 33.25in (844.55mm) Charging Handle: RACK Ambidextrous Charging Handle Trigger: Enhanced Nickel Teflon Safety: BAD-ASS-PRO Built-In: Ambi Magazine, Bolt Release, and BAD-MRB conversion Stock: B5 Bravo Finish: BATTLEARMS Combat Gray Magazine: (1) 10rd Magazine Sights: Optics Ready Platform