The Tactical Solutions X-Ring replacement barrel is machined from 6061-T6 aluminum and is designed to fit the Ruger 10/22 chambered for .22 LR. It has an O.D. of .920" and a 1:16" twist. This replacement barrel is significantly lighter at 15oz and only 16.5" long and more accurate than factory barrels. 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 1/2"x28 threads allow easy addition of a TacSol suppressor or compensator. X-Ring barrels are also compatible with the Ruger SR-22 rifle. This X-Ring barrel is green.