JMac Customs Muzzle Brake w/KeyMount/Facemount Shims Black RRD-4C-1. The experts at JMac Customs crafted these Muzzle Devices from rugged stainless steel with a nitride finish for enhanced resistance against corrosive elements and a longer lifetime of use. The JMac Customs 4C 14-1LH 4-Port Muzzle Brake Suppressor helps mitigate recoil and it prevents your bow from tangling with various gear while in the woods. If you're seeking a permanent attachment for your suppressors then the JMac Customs 4C 14-1LH 4-Port Muzzle Brake with KeyMount and Facemount Shims is the perfect option to complement your favorite AKM. Specifications for JMac Customs 4C 14-1LH 4-Port Muzzle Brake w/KeyMount/Facemount Shims: Manufacturer: JMac Customs Color: Black Finish: Nitride Fabric/Material: 17-4PH Stainless Steel Gun Make: Kalashnikov Length: 14.5 in Condition: New Features of JMac Customs 4C 14-1LH 4-Port Muzzle Brake w/KeyMount/Facemount Shims 4 Port Muzzle Brake Package Contents: JMac Customs 4C 14-1LH 4-Port Muzzle Brake w/KeyMount/Facemount Shims JMac Customs RRD-4C-1: Muzzle Brake w/KeyMount/Facemount Shims Black