Sig Sauer 516 G3 Features The Sig Sauer 516 G3 runs a short-stroke piston system with a 3-position adjustable gas block that keeps the action running reliably across suppressed and unsuppressed configurations while reducing carbon and heat transfer to the bolt carrier. The 16 cold hammer forged barrel with FNC finish and 1:7 twist delivers consistent accuracy and long-term durability while the SIG flash hider compensator manages muzzle rise for faster follow-up shots. Steel-reinforced high-wear components extend service life through sustained hard use. The free-floating M-LOK handguard eliminates barrel pressure for consistent accuracy while offering versatile accessory mounting and fully ambidextrous controls support natural operation for any shooter. Non-reciprocating rear and side charging handles and the Matchlite Duo curved trigger give this 5.56 piston-driven AR rifle a refined competition-capable feel straight from the factory. Sig Sauer 516 G3 Specifications Manufacturer: Sig Sauer Model: 516 G3 Caliber: 5.56 NATO Capacity: 30 rounds Barrel Length: 16 Barrel Material: Cold hammer forged steel Barrel Finish: FNC Barrel Twist: 1:7 Overall Length: 32.6 collapsed 36 extended Overall Height: 7.9 without magazine Overall Width: 3.1 Weight: 8 lb. Frame Material: Alloy Frame Finish: Black anodized Operating System: Short-stroke piston Gas System: 3-position adjustable Handguard: Free-floating M-LOK Trigger: Matchlite Duo curved Controls: Fully ambidextrous Charging Handle: Non-reciprocating rear and side Muzzle Device: SIG flash hider compensator