Bear Creek Arsenal BC-15 6.5 Grendel 20in Bolt Action Style Upper Receiver Heavy Barrel 1-8 Twist 5/8×24 Flash Hider 416R

Bear Creek Arsenal BC-15 6.5 Grendel 20in Bolt Action Style Upper Receiver Heavy Barrel 1-8 Twist 5/8×24 Flash Hider 416R. 5 Grendel upper is compatible with any mil-spec AR-15 lower. Magazine not included. Specifications for Bear Creek Arsenal BC-15 6.5 Grendel 20in Bolt Action Style Upper Receiver: Manufacturer: Bear Creek Arsenal Caliber: 6.5mm Grendel Barrel Length: 20 in Barrel Profile: Heavy Barrel Twist Rate: 1-8 Threads per Inch: 5/8×24 Muzzle Device: Flash Hider Color: Black Gun Model: AR-15 Gun Rail: M-LOK Gun Make: AR Platform Weight: 6.5 lb Flutes: No Package Contents: Bear Creek Arsenal BC-15 6.5 Grendel 20in Bolt Action Style Upper Receiver What firearm models does the manufacturer say Bear Creek Arsenal BC-15 6.5 Grendel 20in Bolt Action Style Upper Receiver is compatible with? The manufacturer suggests that Bear Creek Arsenal BC-15 6.5 Grendel 20in Bolt Action Style Upper Receiver is compatible with AR-15Bear Creek Arsenal UABA-354-6.5RHB2018SS-15ASR: BC-15 6.5 Grendel 20in Bolt Action Style Upper Receiver Heavy Barrel 1-8 Twist 5/8×24 Flash Hider 416R