Sig Sauer MCX-SPEAR LT Barrel & Gas Block Assembly 5.56 NATO 16" Black

The Sig Sauer MCX-SPEAR LT Barrel and Gas Block Assembly is a factory replacement barrel unit for the MCX-SPEAR LT platform, chambered in 5.56 NATO and ready to drop into an existing rifle. This complete assembly includes the barrel, barrel extension, gas block, gas valve, gas piston, and flash hider, so the upper receiver swaps over with no additional parts sourcing required.

The barrel measures 16 inches and features a 1/2x28 thread pitch, allowing the use of standard 5.56 NATO muzzle devices and suppressors. It is finished in a durable Black coating that matches the MCX-SPEAR LT upper receiver and resists wear under sustained fire.

Sig Sauer's short-stroke piston system uses the included gas block and piston to cycle the action, and the assembly retains all of the factory-spec gas system geometry needed for reliable function with both 5.56 NATO and .223 Remington ammunition.

This barrel and gas block assembly is the correct replacement or upgrade component for owners of the Sig MCX-SPEAR LT rifle looking to replace a worn barrel, swap to a fresh setup, or keep a spare on hand.