JMac Customs 2C 14-1LH Slim Muzzle Brake with Bravo Suppressor Mount Black Nitride Black. The RRD-2C is a shortened version of our popular RRD-4C muzzle brake. The RRD-2C was created by removing the 2 smallest ports from the RRD-4C creating a more compact package while still maintaining the ability to mitigate recoil. Specifications for JMac Customs 2C 14-1LH Slim Muzzle Brake w/ Bravo Suppressor Mount: Manufacturer: JMac Customs Color: Black Finish: Nitride Fabric/Material: 17-4PH Stainless Steel Threads per Inch: 14x1 LH Gun Make: Kalashnikov Length: 2.2 in Weight: 1.23 oz Package Contents: JMac Customs 2C 14-1LH Slim Muzzle Brake w/ Bravo Suppressor Mount JMac Customs RRD-2C-14-S: 2C 14-1LH Slim Muzzle Brake with Bravo Suppressor Mount Black Nitride Black