KAK 308 WIN 18" Rifle Gas AR10 Barrel- Stainless* Chamber- 308 Winchester/ 7.62 NATO* Length- 18"* Gas system- Rifle Length* Gas Block Size- .750* Threads- 5/8-24* Finish- Matte Blasted Grey * Twist- 1:10* Material- 416 Stainless * Extension- DPMS LR-308 * Marked for Caliber and Twist* Weight- 44.6 OZ* Gas Block Dimple* Fully Made In House From KAK Industry Produced BlanksMedium Contour All Barrels Are Air Gauge Inspected for Correct Bore Size & Tolerances, completed Barrels are Inspected for Proper Headspace using Calibrated Gauging.