Bear Creek Arsenal BC-15 5.56 NATO 20in Bolt Action Style Upper Receiver Heavy Barrel 1-7 Twist 1/2×28 Flash Hider Parkerized

Bear Creek Arsenal BC-15 5.56 NATO 20in Bolt Action Style Upper Receiver Heavy Barrel 1-7 Twist 1/2×28 Flash Hider Parkerized. 56 Nato upper is compatible with any mil-spec AR-15 lower. Magazine not included. Specifications for Bear Creek Arsenal BC-15 5.56 NATO 20in Bolt Action Style Upper Receiver: Manufacturer: Bear Creek Arsenal Caliber: 5.56x45mm NATO Barrel Length: 20 in Threads per Inch: 1/2×28 Muzzle Device: Flash Hider Color: Black Gun Model: AR-15 Handguard Length: 15 in Gun Rail: M-LOK Gun Make: AR Platform Weight: 7.75 lb Flutes: No Package Contents: Bear Creek Arsenal BC-15 5.56 NATO 20in Bolt Action Style Upper Receiver What firearm models does the manufacturer say Bear Creek Arsenal BC-15 5.56 NATO 20in Bolt Action Style Upper Receiver is compatible with? The manufacturer says that Bear Creek Arsenal BC-15 5.56 NATO 20in Bolt Action Style Upper Receiver is compatible with AR-15Bear Creek Arsenal UABA-358-556RHB2017-15ASR: BC-15 5.56 NATO 20in Bolt Action Style Upper Receiver Heavy Barrel 1-7 Twist 1/2×28 Flash Hider Parkerized