The Proof Research PR15 barrel (part 143674) is a 22-inch 6mm ARC barrel for long-range AR-15 precision rifles. It has a 1:7.5 twist and a 5/8-24 threaded muzzle for brakes, flash hiders or suppressor mounts. 6mm ARC gives the AR-15 flat trajectories and strong wind performance at distance.
- Brand: Proof Research
- Line: PR15 (AR-15)
- Chambering: 6mm ARC
- Barrel length: 22"
- Twist rate: 1:7.5
- Muzzle thread: 5/8-24
- Listed weight: 4.72 lb
- Part number: 143674
