Machined from 6061-T6 aluminum, the X-RING barrel has been designed to make your Ruger(R) 10/22 rifle lighter and significantly more accurate. The X-Ring barrel fits all Ruger 10/22 receivers and most aftermarket 10/22 style receivers. Accuracy is enhanced by a rifled chromoly steel liner with a polished 11 degree crown. Optional threads allow easy addition of a TacSol suppressor or compensator. Weight: 15oz Length: 16.5" O.D.(outside diameter): .920" Threads: 1/2"x28 Twist: 1:16"