JMac Customs GFHC 14-1LH Face KeyMount KeyMicro Black. Barrel must extend past gas block or front sight at least 1.2". In order to use this device with a suppressor it must be installed by a professional - to ensure it is properly mounted and aligned. Do NOT shoot without checking alignment with bore rods. JMac Customs is not responsible for any damage to the suppressor or any injury resulting from improper installation. Some firearms are NOT suitable suppressor hosts just because you can thread this muzzle device on does NOT mean it is safe to use. The GFHC is a combination of the German G36 flash hider and DeadAir Silencers KeyMount. SHIMS NEEDED FOR TIMING. Specifications for JMac Customs GFHC 14-1LH Face KeyMount KeyMicro: 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 Weight: 4.48 oz Condition: New Features of JMac Customs GFHC 14-1LH Face KeyMount KeyMicro G36 Style Flash Hider Comp with KeyMount Feature Package Contents: JMac Customs GFHC 14-1LH Face KeyMount KeyMicro JMac Customs GFHC-14F-KM: GFHC 14-1LH Face KeyMount KeyMicro Black