Rock River Arms Tactical Carbine A4 Upper .458 SOCOM 16-inch

The Rock River Arms Tactical Carbine complete A4 upper is chambered in .458 SOCOM and built on a 16-inch chrome moly bull barrel with a 1:14 twist. This assembly ships with a complete bolt carrier group and charging handle, and features a 15-inch lightweight M-LOK compatible free-float rail. An RRA Operator brake with a 5/8-32 thread pitch is installed and the upper is finished in anodized black for corrosion resistance and a low-profile appearance.

Key Specifications

• The caliber is .458 SOCOM.
• The barrel measures 16 inches.
• The barrel is a chrome moly bull profile with a 1:14 twist.
• This unit includes a complete bolt carrier group.
• It ships with a charging handle assembly.
• The handguard is a 15-inch RRA lightweight M-LOK compatible free-float rail.
• The muzzle device is an RRA Operator brake with a 5/8-32 thread pitch.
• The upper is designed to fit AR-15 receivers.
• The finish is anodized in black.
• The marketed model is the Tactical Carbine complete upper.

This complete upper assembles Rock River Arms engineering and accessory compatibility into a single, factory-prepared unit. Its combination of a heavy-profile chrome-moly barrel, M-LOK free-float rail and matched components makes it a practical choice for AR-15 owners seeking a .458 SOCOM-capable upper with modern accessory support and straightforward installation into compatible receivers.