SIG 516 G3 556NATO 16″ 30RD BLK

Description

The SIG516 G3 is built for shooters who want the cleaner operating cycle of a short-stroke piston system in a platform they already know. Where a direct-impingement AR routes propellant gas back into the bolt carrier group — depositing carbon and heat where tolerances are tightest — the 516 G3 vents that gas through a separate piston and op-rod, keeping the bolt carrier group cooler and notably cleaner through sustained strings of fire. An adjustable gas system lets you dial the setting to match ammunition or a suppressor without changing components, which matters when your load or mission changes between range sessions.

The cold hammer-forged barrel matters most at the chamber end, where the forging process produces a denser, more uniform surface that resists throat erosion under heat and friction. A 1:7-inch twist rate is well-matched to heavier projectiles in the 62–77 grain range — it stabilizes them fully where a slower twist cannot — while still handling standard 55-grain ammunition reliably. The 1/2×28 threaded muzzle ships with a SIG flash hider compensator and accepts the full range of standard AR muzzle devices. Black Nitride barrel finish provides corrosion and wear resistance that works from the inside of the bore outward, not just on the exterior surface.

Ambidextrous controls — bolt catch, magazine catch, safety, and the rear-and-side non-reciprocating charging handle — mean the rifle is equally functional from either shoulder without modification. The free-floating M-LOK handguard removes any contact between the barrel and support hand, which preserves point of impact when accessories are mounted or when a sling loads the forend. Steel-reinforced cam path and feed ramp surfaces extend service life in the highest-wear areas of the action. The rifle ships with one 30-round polymer magazine and no sights, leaving the optics choice entirely to the user.

Shipping and availability: This item cannot be shipped directly to California, Rhode Island and Washington. Check your state and local requirements before ordering.