Salmon River Solutions Unknown Suppressors Reaper Muzzle Brake Anodized Black. Because it is a directional brake it will need to be timed. A shim kit is included with this product. THIS BRAKE ONLY WORKS WITH THE UNKNOWN SUPPRESSORS OG L AND THE REAPER CAN. Specifications for Salmon River Solutions Unknown Suppressors Reaper Muzzle Brake: Manufacturer: Salmon River Solutions Color: Black Finish: Anodized Fabric/Material: 7075 Aluminum Length: 1.5 in Weight: 2 oz Firearms Threads Per Inch: 1.58x24 Height: 1.5 in Width: 1.5 in Features of Salmon River Solutions Unknown Suppressors Reaper Muzzle Brake Self timing with high temp o-ring Package Contents: Salmon River Solutions Unknown Suppressors Reaper Muzzle Brake Spanner Wrench Shim Kit Salmon River Solutions 1148: Unknown Suppressors Reaper Muzzle Brake Anodized Black