SIG SAUER MCX Spear 7.62 NATO Gas Valve Threaded Barrel And Gas Block Assembly 13in. 62 NATO SPEAR. Complete with barrel and gas block assembly. Specifications for SIG SAUER MCX Spear 7.62 NATO Gas Valve Threaded Barrel And Gas Block Assembly: Manufacturer: SIG SAUER Color: Black Caliber: 7.62x51mm NATO Threads per Inch: 5/8-24 Gun Make: SIG Sauer Gun Model: SIG Sauer MCX Gun Type: Rifle Condition: New Package Contents: SIG SAUER MCX Spear 7.62 NATO Gas Valve Threaded Barrel And Gas Block Assembly SIG SAUER Infinite Guarantee What firearm models does the manufacturer say SIG SAUER MCX Spear 7.62 NATO Gas Valve Threaded Barrel And Gas Block Assembly is compatible with? The manufacturer says that SIG SAUER MCX Spear 7.62 NATO Gas Valve Threaded Barrel And Gas Block Assembly is compatible with SIG Sauer MCXSIG SAUER 8901499: MCX Spear 7.62 NATO Gas Valve Threaded Barrel And Gas Block Assembly 13in