The HALCYON suppressor series from Advanced Armament Company (AAC) is the versatile easy-to-use can for rimfire and 5.7mm suppression. The suppressor is constructed from both titanium and 17-4PH T6 stainless steel with a black Cerakote finish. The HALCYON features a very strong titanium 1/2" x 28 TPI direct thread mount to ensure maximum lightweight operation without sacrificing performance. This suppressor fits rifles or pistols chambered in .22 LR, .17 HMR, .22 WMR and is even rated for 5.7x28mm. The suppressor's length can easily be reduced from 5.8" (6.1oz.) to 3.41" (4.5oz.) to fit your suppression / loadout needs. The 1" diameter HALCYON can reduce the sound by around 42 decibels