SilencerCo Alpha ASR Mount Black. Once shouldered the locking ring ensures the suppressor will not rotate or work itself loose under a heavy firing schedule. The ASR (Active Spring Retention) Mount is a quick attach/detach system for almost all SilencerCo suppressors. The simple one-hand-on one-hand-off mounting system is compatible with all ASR Muzzle Devices to promote ease of transfer from one silencer to another. Once shouldered the locking ring ensures the silencer won't rotate or work itself loose under a heavy firing schedule. Specifications for SilencerCo Alpha ASR Mount: Manufacturer: SilencerCo Fabric/Material: 17-4 Stainless Steel Color: Black Finish: Black Oxide Weight: 3.31 oz Condition: New Tube Diameter: 1.5 in Features of SilencerCo The Alpha Active Spring Retention Mount Alpha model is compatible with Omega K 9/45 Octane 9/45 and Harvester 300. Package Contents: SilencerCo The Alpha Active Spring Retention Mount SilencerCo AC2632: The Alpha Active Spring Retention Mount Black