Proof Research Carbon Fiber AR-15 Barrel 224 Valkyrie 22" 1:7 Twist 1/2-28 Threading, Rifle+1 Length Gas, .750" Gas Block Size Out of stock. Check back later... $979.00 MSRP Price: $895.00 Notify me when this item is back in stock (log in required) Description Details Reviews Shipping info UPC: 843068110294Manufacturer: Proof ResearchModel: 110294Caliber: 224 ValkyrieCategory: BarrelsPartsOtherStock: 0Unit/Measure: ea This item may be shipped directly to your home address, unless you live in a restricted state.