SIG SAUER MCX-Spear LT 11.5in 5.56 Barrel And Gas Block Assembly 11.5in. 56 MCX-SPEAR LT. Complete with barrel and gas block assembly. Specifications for SIG SAUER MCX-Spear LT 11.5in 5.56 Barrel And Gas Block Assembly: Manufacturer: SIG SAUER Color: Black Caliber: 5.56x45mm NATO Barrel Length: 11.5 in Threads per Inch: 1/2x28 Barrel Material: Stainless Steel Gun Make: SIG Sauer Gun Model: Sig Sauer MCX-SPEAR LT Gun Type: Rifle Condition: New Package Contents: SIG SAUER MCX-Spear LT 11.5in 5.56 Barrel And Gas Block Assembly SIG SAUER Infinite Guarantee What firearm models does the manufacturer say SIG SAUER MCX-Spear LT 11.5in 5.56 Barrel And Gas Block Assembly is compatible with? The manufacturer says that SIG SAUER MCX-Spear LT 11.5in 5.56 Barrel And Gas Block Assembly is compatible with Sig Sauer MCX-SPEAR LTSIG SAUER 8901313: MCX-Spear LT 11.5in 5.56 Barrel And Gas Block Assembly 11.5in