JMac Customs Muzzle Device 14-1LH/1.375-24 Thread Black. 375-24 thread pitch while maintaining the shortest overall length possible. By itself the ZERO does not offer flash or recoil mitigation. It does however offer the user the ability to configure their firearm by attaching the device of their choice. The ZERO-14F-X37 is compatible with the TP-37 BDS-37 and BDS-37-EXT. Specifications for JMac Customs Zero-14F-X37 Muzzle Device: Manufacturer: JMac Customs Fabric/Material: 17-4PH Stainless Steel Color: Black Threads per Inch: 14x1 LH Weight: 3 oz Condition: New Gun Make: Kalashnikov Features of JMac Customs Zero-14F-X37 Muzzle Device Zero Mount Package Contents: JMac Customs Zero-14F-X37 Muzzle Device JMac Customs Zero-14F-X37: Zero-14F-X37 Muzzle Device 14-1LH/1.375-24 Thread Black