Shaw Barrels AR Barrels Features The Shaw Barrels AR Barrel is machined from 416R stainless steel a material prized for its corrosion resistance and ability to hold tight tolerances over long strings of fire. The 1:7.5 twist rate is matched to heavier 6mm ARC projectiles giving the barrel the stability needed to stabilize long-range bullets at distance. An HBAR profile adds extra mass along the barrel for added rigidity and heat capacity helping the barrel resist stringing shots as it warms up during extended range sessions. The bead blast matte finish provides a non-reflective surface while still showing off the stainless steel underneath. This 18 barrel is built for a rifle length gas system with a .750 dimpled gas journal matching standard rifle length gas blocks and tubes. A 5/8x24 threaded muzzle accepts muzzle brakes compensators and suppressor mounts sized for that pitch giving builders flexibility in how they finish the muzzle end. The feed ramp is cut to 30 caliber dimensions and the chamber is headspaced for 6.5 Grendel Type II bolts so builders need to match their bolt accordingly since no bolt is included. This barrel suits precision-minded builders assembling a dedicated 6mm ARC upper for sale at GrabAGun. Shaw Barrels AR Barrels Specifications Manufacturer: Shaw Barrels Model: AR Barrels Caliber: 6mm ARC Barrel Length: 18 Barrel Material: 416R Stainless Steel Barrel Finish: Bead Blast Matte Barrel Description: HBAR Profile Twist Rate: 1:7.5 Thread Pattern: 5/8x24 Gas System: Rifle Length Weight: 2.50 lbs Available At: GrabAGun