The Rosco Purebred is a 10.5-inch 300 Blackout barrel for AR-15 pistol builds. It has a heavy pistol profile, a 1:7 twist suited to heavier 300 BLK bullets, and a 5/8-24 threaded muzzle. Made from stainless steel.
- Brand: Rosco Manufacturing
- Model: Purebred
- Caliber: 300 Blackout
- Length: 10.5 in
- Profile: Heavy pistol
- Twist: 1:7
- Muzzle thread: 5/8-24
- Material: Stainless steel
- Fits: AR-15
- Manufacturer part number: PB-105-HB-300BLK-7-P
