SIG BARREL & GAS ASSY, MCX, SPEAR LT, 16″, 5.56

Replace or build a factory-compatible MCX SPEAR-LT upper with this SIG-spec 16″ barrel and matched gas assembly. This complete assembly includes a 16″ 5.56 NATO barrel and the proper gas block/assembly set to factory gas port dimensions so dwell and cycling are tuned for reliable operation. Machined from heat-treated premium steel and finished with a corrosion-resistant coating, the assembly is ideal for service replacements, upper builds, or refurbishment of SPEAR-LT uppers. Drop-in fit for compatible MCX SPEAR-LT uppers; confirm compatibility with your handguard, muzzle device, and local laws before sale.