Black Rain Ordnance Complete Upper .458 Black BRO-SPEC15-CU458S. These AR15 Upper Receivers by Black Rain Ordnance feature what you need for a performance .458 SOCOM build including a 16in barrel with 1x14 twist a bolt carrier group with .458 bolt a .458 muzzle brake and more When you want the best quality for your AR choose the BRO AR15 Complete Upper Receiver Specifications for Black Rain Ordnance SOCOM .458 Complete Upper Receiver: Manufacturer: Black Rain Ordnance Caliber: .458 SOCOM Barrel Length: 16 in Muzzle Device: .458 Muzzle Brake Finish: Anodized Color: Black Condition: New Magazine Included: No Black Rain Ordnance SOCOM .458 Complete Upper Receiver Includes: 16in 416R stainless steel .458 SOCOM barrel (1x14 twist) Spec15 upper receiver with expanded ejection port .458 SOCOM engraved dust cover Charge handle with oversized Tac-Latch 15in M-LOK hybrid handguard Spec15 bolt carrier group with .458 bolt .458 muzzle brake Metal magazine optimized for .458 SOCOM rounds Black Rain Ordnance BRO-SPEC15-CU458S: Complete Upper .458 Black