JP Enterprises Supermatch Barrel Kit 6.5 Creedmoor Chamber 22in Medium Contour Black JPSM6.5CK-22M8XL-BT. 5 Creedmoor Chamber 22" Medium Contour 1:8 Twist Extra Long Rifle-Length Gas System Polished Stainless Finish Headspaced Jpeb-308Hp High Pressure...