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 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.Features: SKU: RM400-16B-TRD-CA CALIBER: 5.56 NATO BARREL LENGTH: 16 in (292 mm) MAGS INCLUDED: (1) 10rd Polymer Mag MAG TYPE: AR-15 STATE COMPLIANT: CA ACTION TYPE: Semi-Auto STOCK TYPE: Fixed BARREL MATERIAL: Stainless Steel TRIGGER TYPE: SIG Enhanced TWIST RATE: 1:08 FOREND TYPE: Alloy GRIP TYPE: Polymer RECEIVER FINISH: Hard Coat Anodized OVERALL LENGTH: 30.8 in (782 mm) OVERALL WIDTH: 2.5 in (64 mm) HEIGHT: 7.5 in (191 mm) THREADS: N/A ACCESSORY RAIL: M-LOK OPERATING SYSTEM: Direct Impingement WEIGHT: 7 lbs (3.2 kg)