The (ASR) Active Spring Retention Mount is a quick attached / detach system for your suppressors that pairs with the ASR Flash Hider, ASR Closed-Tine Flash Hider, ASR Muzzle Brake, and ASR Single Port Muzzle Brake and is one of the best performing mounting systems available for rifles. The locking ring ensures that the suppressor will not rotate while in use. The mount seats over your ASR Muzzle Device and creates a direct connection to your suppressor, allowing for the use of the muzzle device with the suppressor for even better performance. Charlie accessories are compatible with Chimera 300, Omega 36M, Hybrid 46M, Saker 556K, Velos LBP Series, and Charlie MAAD Brakes.