The SIG516 G3 extends the legacy of the 516 series, bringing new technology and an updated product ID to the venerable weapons system. Tested around the world and perfected at home in New Hampshire, the SIG516 G3 combines over a decade of internal engineering know-how on similar rifle projects into the most rugged, durable platform in its class. Specifications and Features: CALIBER: 5.56 NATO BARREL: 16 in [406.4 mm] BARREL MATERIAL: Cold Hammer Forged Steel TWIST RATE: 1:7 THREADS: 1/2 in - 28 tpi tapered shoulder MUZZLE DEVICE: SIG Flash Hider-Compensator ACTION TYPE: Semi-Auto OPERATING SYSTEM: Short-Stroke-Piston STOCK: 6-Position Magpul DT TRIGGER TYPE: Matchlite Duo Curved TRIGGER SHAPE: Curved FOREND: Alloy ACCESSORY RAIL: M-LOK/Picatinny MAG TYPE: AR-15 MAGS INCLUDED: (1) 30rd Polymer Mag COLOR: Black Anodized RECEIVER: Black Anodized OVERALL LENGTH: 36.5 in [927 mm] COLLAPSED LENGTH: 33 in