Proof Research 134542 Bolt Action Barrel Pre-Fit 6mm Creedmoor 16″ 1:7.50″ Twist (4 Groove), 5/8″-24 tpi Threaded, Carbon Fiber, Drop-In Design for Sig Cross
Tactical Solutions XRBRLPERFMB X-Ring Performance Barrel 22 LR 16.50″, Matte Black Spiral Fluted Chromoly Steel Fits Ruger 10/22