The Strike Industries Oppressor is a quick-detach concussion-reduction blast shield engineered to tame side-blast on aggressive muzzle brakes and compensators without killing their braking performance. Where typical concussion devices simply sleeve the brake and vent gas straight back, the Oppressor uses computer-modeled internal geometry to actively pull combustion gases forward and redirect them through linear vents - keeping the brake working while cutting the side concussion that beats up shooters next to you on the line. The proprietary quick-detach mount lets you snap the Oppressor on before transitioning to a prone position or stepping into an indoor bay, then strip it off when you want full braking effect. One size fits both 5.56 / .223 and .308 / 7.62 Strike Industries muzzle devices. Function: Concussion-reduction blast shield Compatible SI brakes: Venom-FH, Checkmate Comp, King Comp, MK-9 Comp, J-Comp Gen 2, Sierra Comp, Triple Crown Comp Caliber range: 5.56 / .223 and .308 / 7.62 Mount: Proprietary quick-detach Use: Range courtesy, indoor / prone shooting, training environments Fits only Strike Industries muzzle devices in the listed family. Confirm host brake is on the compatibility list before ordering.