Caliber: .22 LR .17 HMR .22 Mag .22 WMR .22 Hornet 5.7mm - Muzzle Average dB: 113.8 (.22 LR) 123.3 (.17 HMR) 125.8 (5.7mm) - Materials: Stainless Steel - Diameter: 1 - Length: 5.98 - Weight: 6.8 oz. - The Spectre 22 has the quietest first round pop of any rimfire silencer and is made of durable stainless steel construction which enables it to handle a range of ammunition from .22LR to 5.7mm. SilencerCo’s unique CTA (Click Together Assembly) baffle design makes the Spectre 22 equipped to handle the harshness and debris of rimfire ammunition with ease. After heavy use - even full auto .22LR - the Spectre 22 will remain exceptionally quiet reliable and user-serviceable.