The M400 TREAD is an optics ready aluminum frame rifle. TREAD features a 16" stainless steel barrel with a free-floating M-LOK handguard a single-stage polished/hard-coat trigger ambidextrous controls a Magpul(TM) SL-K 6 position telescoping stock a mid-length gas system and is available in 5.56 NATO.The TREAD branded accessories include: M-LOK handguard with lightening cuts to reduce weight available in 13" and 15" lengths; 3 chamber compensator; Ambidextrous charging handle made of aircraft grade aluminum and a dual roll pin design; ROMEO5 optic featuring a 2MOA dot with ten illumination settings MOTAC and 50k battery life; Flip-up front and rear iron sights that are easy to install adjustable and deploy quickly; M-LOK front sight adapter with co-witness height made of lightweight aluminum; Multiple configurations of M-LOK grip kits made of high strength polymer; Factory upgraded flat blade single stage trigger Specifications: OPERATING SYSTEM: Direct Impingement CALIBER: 5.56 NATO OVERALL LENGTH: 30.8 in (782 mm) OVERALL WIDTH: 2.5 in (64 mm) HEIGHT: 7.5 in (191 mm) BARREL LENGTH: 16 in (406 mm) WEIGHT: 7 lbs (3.2 kg) TWIST RATE: 1:8 MAG TYPE: AR-15