Magnum Research Magnum Lite Graphite Barrel – 17 Barrel – .22 Long Rifle – 1:16 Twist Rate – Threaded 1/2×28 – Ultra-Lightweight Contour – .920 Diameter – Stainless Steel Muzzle and Receiver – Barrel Shaft made from carbon fiber sleeve – Drop in installation – Matte Black – Fits: Ruger 10/22 models chambered in .22LR – Note: Does NOT fit Ruger 10/22 Takedown Models