GRS Riflestocks GRS Adjustable Hunting Tikka 695/690/658, Brown

Proof Research 12.5" 300BLK Carbon Fiber 1:7 Pistol AR-15 BarrelProof Research's Caliber Matched Gas System results in a gas system tuned for the cartridge and length of the barrel.With high-performance cartridges such as 22 Nosler and 6.5 Creedmoor, the bore pressure remains higher further down the barrel.Proof ensures the gas system pressure is the same as the AR platforms were originally designed to be. This is achieved by moving the port location, resulting in a noticeably softer recoil impulse, less fouling in the receiver, increased reliability of extraction, and less wear and tear on brass.This helps keep you on target and shooting while taking advantage of the latest high-performance cartridges.Proof Research recommends double-checking and ensuring proper headspace before firing your rifle.Specifications Barrel Chamber: 300 BLK Barrel Length: 12.5 Barrel Twist Rate: 1 in 7 Gas System Length: Pistol Gas Block Diameter: .750 Muzzle Thread: 5/8 x 24