The Rock River Arms Tactical Carbine complete upper (MPN SOC0564) is an A4-pattern upper chambered in .458 SOCOM with a 16-inch chrome-moly bull barrel and 1:14 twist.

Key Specifications

• A4-pattern complete upper receiver
• Chambered in .458 SOCOM
• 16-inch chrome-moly bull barrel
• 1:14 twist rate
• Includes a complete bolt carrier group
• Includes charging handle assembly
• 15-inch RRA lightweight M-LOK free-float rail
• RRA Operator muzzle brake, 5/8-32 thread pitch
• Rock River Arms Tactical Carbine model line

Frequently Asked Questions

Does this upper include a lower receiver?
No, it’s a complete upper only and requires a compatible AR-15 lower to finish the rifle.

What barrel and twist does it use?
A 16-inch chrome-moly bull barrel with a 1:14 twist, chambered in .458 SOCOM.

Does it come with a bolt carrier group?
Yes, a complete BCG and charging handle assembly are included.

Buy the Rock River Arms Tactical Carbine Upper

Drop a complete .458 SOCOM upper onto your AR-15 build with this Tactical Carbine assembly from Rock River Arms. Order from a Lubbock, TX gun shop in our AR15 uppers lineup.