USED Jacob Grey Firearms 6in 9mm Luger 1/2x28 Barrel AR-9 Black 9MM6B EDEMO2 Condition Fair Used. Pairs perfectly with JG low profile handguard. DISCLAIMER: Before any muzzle device make sure a 9mm round will drop freely through the device center Specifications for Jacob Grey Firearms 9mm Luger Barrel: Manufacturer: Jacob Grey Firearms Color: Black Finish: QPQ Salt Bath Nitride Fabric/Material: 4150 CMV Steel Caliber: 9mm Luger Barrel Length: 5.5 in Barrel Profile: Light Weight Barrel Twist Rate: 1-10 Barrel Material: 4150 CMV Steel Gun Make: AR Platform Gun Model: AR-9 AR-15 Condition: Factory DEMO Condition Quality: Fair Condition Details: Used Firearms Threads Per Inch: 1/2x36 Rifling Profile: Button Rifling Features of Jacob Grey Firearms 9mm Luger Barrel: Integrated feed ramp; Designed to work with both Colt and Glock style AR-9 builds; Specifically designed to complement the Jacob Grey JG-9 Upper receiver. Package Contents: Jacob Grey Firearms 9mm Luger Barrel What firearm models does the manufacturer say Jacob Grey Firearms 9mm Luger Barrel is compatible with? The manufacturer suggests that Jacob Grey Firearms 9mm Luger Barrel is compatible with AR-15 AR-9Jacob Grey Firearms 9MM6B: 6in 9mm Luger 1/2x28 Barrel AR-9 Black Condition Fair Used