USED JMac Customs 4C 14-1LH 4-Port Muzzle Brake with KeyMount Black Nitride Black RRD-4C-14F-KM. This is designed to be permanently attached to a 14.5 inch barrel and adapt to KeyMo compatilble suppressors We recommend this muzzle device be professionally installed on our 14.5" barrel by one of our Kalashnismiths to ensure alignment. This device is designed to be tightened against the face of the barrel. You must use our face shims (optional) or your barrel MUST be faced to properly time this muzzle device. JMac Customs is NOT responsible for an improperly installed muzzle device. Kalashnismith install is highly recommended. Specifications for JMac Customs 4C 14-1LH 4-Port Muzzle Brake w/ KeyMount: Manufacturer: JMac Customs Color: Black Finish: Nitride Fabric/Material: 17-4PH Stainless Steel Threads per Inch: 14x1 LH Gun Make: Kalashnikov Length: 2.1 in Condition: New Features of JMac Customs 4C 14-1LH 4-Port Muzzle Brake w/ KeyMount 4 Port Muzzle Brake 14mm LH 2.82" long Only adds 1.5'' Sleeves the barrel 1.32" Keymount & X-Series Suppressor Compatibility Package Contents: JMac Customs 4C 14-1LH 4-Port Muzzle Brake w/ KeyMount JMac Customs RRD-4C-14F-KM: 4C 14-1LH 4-Port Muzzle Brake with KeyMount Black Nitride Black