JMac Customs 4C 26-1.5LH 4-Port Muzzle Brake Black Nitride Black. This one of a kind combination device gives you control over your firearm like you've never had before while only adding 1.5'' in length and 3.56 oz in weightProduct The RRD-4C has cut-outs on the top sides to allow gas to vent upwards in turn forcing the barrel downwards and virtually eliminating muzzle rise with an extremely low flash signatureAdditional Pictures can be foundHERE Reduces flash on barrels 11'' and longerSee how the RRD-4C compares to 28 other popular AK muzzle devices in Flash Reduction spring and detent kit for installation is NOT included manufacturer's page link - https://www.jmac-customs.com/m92-m85-pap-spring-and-detent-set/ Specifications for JMac Customs 4C 26-1.5LH 4-Port Muzzle Brake: Manufacturer: JMac Customs Color: Black Finish: Nitride Fabric/Material: 17-4PH Stainless Steel Threads per Inch: M26x1.5 LH Gun Make: Kalashnikov Length: 2.5 in Weight: 3.7 oz Features of JMac Customs 4C 26-1.5LH 4-Port Muzzle Brake 4 Port Muzzle Brake Package Contents: JMac Customs 4C 26-1.5LH 4-Port Muzzle Brake JMac Customs RRD-4C-26: 4C 26-1.5LH 4-Port Muzzle Brake Black Nitride Black