Rock River Arms 450 Bushmaster Tactical Carbine Upper Receiver

Introducing the Rock River Arms A4 Mid-Length Upper, designed for those who demand precision and power in their shooting experience. Chambered in .450 Bushmaster, this upper assembly is built to deliver robust performance with every shot.

The heart of this system lies in its 16-inch chrome moly barrel, featuring a 1:24 twist rate that ensures optimal stability and accuracy for heavy projectiles. This combination of materials and design guarantees durability while maintaining consistent performance under varied conditions.

Complementing its formidable barrel is the RRA 13-inch M-Lok compatible lightweight free float rail. This feature not only reduces weight but also provides ample space for mounting accessories without compromising balance or handling. The free-floating design enhances accuracy by minimizing external pressures on the barrel during firing.

Additionally, the inclusion of the RRA Operator Brake with a 5/8-32 thread significantly mitigates recoil and muzzle rise, allowing for quicker follow-up shots—a crucial advantage when precision counts most.

This complete upper assembly comes equipped with a bolt carrier group and charging handle assembly, ensuring seamless operation right out of the box. Plus, it includes a five-round magazine tailored to your .450 Bushmaster needs.

The Rock River Arms A4 Mid-Length Upper embodies reliability and craftsmanship—qualities essential to any serious shooter’s arsenal. Whether you are hunting big game or seeking enhanced range capabilities, this upper delivers unmatched power and efficiency.