SilencerCo ASR Alpha Mount Adapter For Omega 9K/Nano ASR/Harvester 300 Black Steel 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.