Quarter Circle 10 45 ACP Complete Upper Receiver w/ PMUR

Quarter Circle 10, THE AR Pistol Caliber BRAND. Leader in top of the line, dedicated AR15 Pistol Caliber parts. *This product is not compatible with DI gas systems or rifle-caliber bolts. Specifications for Quarter Circle 10 45 ACP Complete Upper Receiver w/ PMUR: Manufacturer: Quarter Circle 10 Cartridge: .45 ACP Barrel Twist Rate: 1-16 Threads per Inch: .578×28 Muzzle Device: A2 Flash Hider Color: Black Gun Model: QC10 Blu’ Whistler, QC5, QC10 Rider, QC10 Ranger Condition: New Fabric/Material: Billet Gun Rail: M-LOK Gun Make: AR Platform Bolt Carrier Group Included: MIL-SPEC Charging Handle Included: MIL-SPEC Magazine Included: No Features of Quarter Circle 10 45 ACP Complete Upper Receiver w/ PMUR: Designed specifically for pistol-caliber AR builds QC10 Billet Rear Charging Upper Receiver .45ACP QPQ Nitride-Treated Barrel Compatible with QC10 Big Tex (GLF) Lower Receiver QC10 .45ACP Bolt MLOK Handguard QC10 Pistol Caliber Flash Hider Test-fired at the factory Made For the AR Platform- Not Modified Package Contents: Quarter Circle 10 45 ACP Complete Upper Receiver w/ PMUR