The Proof Research PR15 barrel is a 20-inch rifle-length AR-15 barrel chambered in 22 ARC. It is stainless steel with a 1:7 twist suited to heavy, high-BC bullets and a 5/8-24 threaded muzzle for brakes or suppressors. The listing describes it as a standard profile.
- Brand: Proof Research
- Part number: 143483
- Model: PR15
- Chambering: 22 ARC
- Length: 20 in
- Twist: 1:7
- Gas system: rifle length
- Muzzle thread: 5/8-24
- Material: stainless steel
