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ARMORER WORKS Tightbore Inner Barrel + Performance Bucking: 136.6mm Length Take Down Pin SHS 6mm Gearbox BearingMaterials: Electroplated Brass & Silicone Compatibility: Compatible with most WE (Gen 2) AW Hi Capas Features: + High Performance Bucking + Rifled grooves on muzzle end of inner barrel for reduced turbulence, enhanced trajectory stability and reduced friction when projectile exits the inner barrel Bore Size: 6. 01mm (+ 0. 01mm) Inner Barrel Length: 136. 6mm Parts Included: 1 x HXAS#1 (Silver) Tightbore 1 x HXAS#8 (Red) High Performance