Bear Creek Arsenal BC-15 5.56 NATO 7.5in Bolt Action Style Upper Receiver M4 Barrel 1-7 Twist 1/2×28 Flash Hider 416R

Bear Creek Arsenal BC-15 5.56 NATO 7.5in Bolt Action Style Upper Receiver M4 Barrel 1-7 Twist 1/2×28 Flash Hider 416R. 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 7.5in Bolt Action Style Upper Receiver: Manufacturer: Bear Creek Arsenal Caliber: 5.56x45mm NATO Barrel Length: 7.5 in Barrel Profile: M4 Barrel Twist Rate: 1-7 Threads per Inch: 1/2×28 Muzzle Device: Flash Hider Color: Black Gun Model: AR-15 Handguard Length: 7 in Gun Rail: M-LOK Gun Make: AR Platform Weight: 3.75 lb Flutes: No Package Contents: Bear Creek Arsenal BC-15 5.56 NATO 7.5in Bolt Action Style Upper Receiver What firearm models does the manufacturer say Bear Creek Arsenal BC-15 5.56 NATO 7.5in Bolt Action Style Upper Receiver is compatible with? The manufacturer says that Bear Creek Arsenal BC-15 5.56 NATO 7.5in Bolt Action Style Upper Receiver is compatible with AR-15Bear Creek Arsenal UABA-309-556PM47.517SS-7ASR: BC-15 5.56 NATO 7.5in Bolt Action Style Upper Receiver M4 Barrel 1-7 Twist 1/2×28 Flash Hider 416R