The Sparrow 22 silencer is designed with multi part containment (MPC) technology, which allows the Sparrow 22 to be easily disassembled for cleaning and maintenance after heavy use. Because the .22 LR round is not copper jacketed, molten lead and carbon debris will explode into the silencer when the projectile exits the muzzle. After some time, it is possible for a .22 suppressor to fill completely with lead and become heavy and ineffective. To avoid this issue, .22 silencers must be disassembled for cleaning and regular maintenance. Full Auto Rated on .22 LR. Mfg: Silencerco SPECS: Caliber: .22 LR, .17 HMR, .22 Mag, .22 WMR, .22 Hornet, 5.7A-28 FN. Weight: 6.5 Oz. Diameter: 1.062". Length: 5.08". Sound reduction: 41dB. Finish: Black Oxide. Materials: Alloy Steel, Heat Treated 17-4 PH Stainless Steel. Mount: 1/2A-28 threads.