Bear Creek Arsenal BC-15 .458 SOCOM 16in Bolt Action Style Upper Receiver Heavy 1-14 5/8x32 Flash Hider Parkerized. Adding any other product to your cart will not allow you to check out. Magazine not included. Specifications for Bear Creek Arsenal BC-15 .458 SOCOM 16in Bolt Action Style Upper Receiver: Manufacturer: Bear Creek Arsenal Caliber: .458 SOCOM Barrel Length: 16 in Barrel Profile: Heavy Barrel Twist Rate: 1-14 Threads per Inch: 5/8x32 Muzzle Device: Flash Hider Finish: Parkerized Color: Black Gun Model: AR-15 Handguard Length: 15 in Gun Rail: M-LOK Gun Make: AR Platform Weight: 4.5 lb Flutes: No Package Contents: Bear Creek Arsenal BC-15 .458 SOCOM 16in Bolt Action Style Upper Receiver What firearm models does the manufacturer say Bear Creek Arsenal BC-15 .458 SOCOM 16in Bolt Action Style Upper Receiver is compatible with? The manufacturer says that Bear Creek Arsenal BC-15 .458 SOCOM 16in Bolt Action Style Upper Receiver is compatible with AR-15Bear Creek Arsenal UABA350458CHB1611487515ASR: BC-15 .458 SOCOM 16in Bolt Action Style Upper Receiver Heavy 1-14 5/8x32 Flash Hider Parkerized