Rock River Arms Mid A4 Upper .450 Bushmaster 16-inch 5rd

Rock River Arms delivers a complete mid-length A4 upper chambered in .450 Bushmaster. The assembly features a 16-inch chrome moly barrel with a 1:24 twist and a lightweight free-float rail for accessory mounting. This upper ships complete with a bolt carrier group, charging handle, RRA Operator Brake, and a 5-round magazine.

Key Specifications

• Compatible with the AR-15 platform.
• Chambered for .450 Bushmaster.
• The barrel measures 16 inches and is constructed from chrome moly.
• The rifling uses a 1:24 twist rate.
• Includes a 13-inch M-LOK free-float rail for mounting accessories.
• Equipped with an included RRA Operator Brake (5/8-32).
• Finished in black anodized for corrosion resistance and low reflectivity.
• Supplied as a complete upper with bolt carrier group and charging handle.
• Includes a 5-round magazine.

This complete Rock River Arms Mid A4 upper provides a ready-to-install solution for shooters seeking a .450 Bushmaster setup with a durable 16-inch barrel and modern M-LOK interface. Its complete configuration simplifies installation and reduces build time while delivering straightforward, dependable function for hunting and other practical shooting applications.