JP Enterprises Supermatch Barrel Kit .223 Chamber 16in Light Contour Black. 223 Chamber 16" Light Contour 1:8 Twist Mid-Length Gas System Polished Stainless Finish Headspaced Jpeb-223 Enhanced Bolt Jptd650S Blk Thermal Dissipator Jptre3-2B Comp Machine Timed And Blended To The Barrel Jpgs-9D Click Detent Adjustable Gas Block With Installed Mid-Length Gas Tube Specifications for JP Enterprises Supermatch Barrel Kit .223 Chamber 16in Light Contour: Manufacturer: JP Enterprises Caliber: .223 Remington Package Contents: JP Enterprises Supermatch Barrel Kit .223 Chamber 16in Light Contour JP Enterprises JPSM223K-16L8M-BT: Supermatch Barrel Kit .223 Chamber 16in Light Contour Black