The Sparrow 22 was designed with simplicity, durability, and user serviceability as its core objectives, and has the quietest 10 round average of any silencer in its class. Patented Multi-Part Containment (MPC) technology facilitates ease of diassembly and reassembly - an essential function of rimfire suppressors. The internal MPC construction uses two half tubes that pull away from a monolithic core, which ensures that the Sparrow 22 will remain easy to clean after extended periods of use with notoriously dirty rimfire ammunition. Key Features: User Serviceable Quietest MultiCaliber Full-Auto Rated Specifications: Caliber: .22 LR Weight: 6.5 oz Length: 5.08" Diameter: 1.06" Materials: Stainless Steel Muzzle Average: .22 LR: 112.7 dB