TacFire .300 AAC Blackout 5 inch Upper Receiver 5/8x24 A2 Flash Hider Nitride Black. Dive into a world where impeccable features and craftsmanship merge ensuring precision and trustworthiness in every shot. Specifications for TacFire .300 AAC Blackout 5 inch Upper Receiver: Manufacturer: TacFire Caliber: .300 AAC Blackout Overall Length: 5.5 in Barrel Length: 5 - 6 in 5 in Barrel Profile: Government Barrel Twist Rate: 1-8 Firearms Threads Per Inch: 5/8x24 Handguard Type: M-LOK ATLAS S-ONE Muzzle Device: A2 Flash Hider Finish: Black Nitride Color: Black Fabric/Material: Steel Handguard Length: 4 in Gun Make: AR Platform TacFire BU3005 300 Blackout 5" Black Nitride Barrel TacFire BU3005: .300 AAC Blackout 5 inch Upper Receiver 5/8x24 A2 Flash Hider Nitride Black