The ASR Mount is compatible with all ASR muzzle devices, allowing you to use one convenient mounting system for various suppressors. Once shouldered, the locking ring ensures the suppressor will not rotate or work itself loose under a heavy firing schedule. This Alpha model is compatible with Omega K 9/45, Octane 9/45 and Harvester 300.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. Feature: Alpha accessories are compatible with Harvester 300 and Omega K