Rock River Arms BT-3 Completed Upper Receiver 6.5mm Creedmoor 28in 20in Barrel Standard SS Fluted Profile 1-10 Twist 5/8x24 Thread M-LOK Handguard

Rock River Arms

Overview

The Rock River Arms BT-3 Completed Upper Receiver is designed for serious precision shooting with its 28-inch barrel chambered in 6.5mm Creedmoor, a caliber known for its long-range capabilities. The 1:10 twist rate stabilizes heavier projectiles, ensuring accuracy at extended distances, while the 5/8x24 thread pitch allows for easy attachment of muzzle devices. This upper receiver is commonly found in builds focused on target shooting and precision hunting, where accuracy and barrel length are critical.