SilencerCo Rimfire Supressor Adapter Smith & Wesson M&P 22 Black. It allows the use of the Octane 9 and Octane 45 on a fixed barrel firearm with thread sizes 1/2 X 28 1/2 X 36 and 5/8 X 24. Made with stainless steel and given a black oxide finish. Specifications for SilencerCo Delta Adapter: Manufacturer: SilencerCo Fabric/Material: Steel Color: Stainless Threads per Inch: 1/2x28 Condition: New Package Contents: SilencerCo Rimfire Suppressor Adapter The SilencerCo Octane Adapter For CZ Scorpion AC1348 is a quality addition to the SilencerCo lineup. For more great deals on Gun Parts by SilencerCo please browse our SilencerCo Gun Parts page. What firearm models does the manufacturer say SilencerCo Delta Adapter is compatible with? The manufacturer says that SilencerCo Delta Adapter is compatible with Walther P22 Smith & Wesson M&P 22 Compact FN Five-seveNSilencerCo AC875: Rimfire Supressor Adapter Smith & Wesson M&P 22 Black