The RRA CMPLT MID A4 UPR 450BM 16" 5RD by Rock River Arms is a robust upper receiver assembly designed for AR-15 platforms. Featuring a 16-inch chrome moly barrel with a 1:24 twist rate, this upper is chambered in .450 Bushmaster, offering powerful performance for various shooting applications. The mid-length gas system is complemented by a lightweight free-float handguard compatible with M-Lok accessories, providing flexibility for customization and enhanced barrel cooling. The integrated Rock River Arms Operator Brake, threaded 5/8-32, helps manage recoil and muzzle rise.

This complete upper includes a precision-machined bolt carrier group and a charging handle, ensuring reliable cycling and ease of operation. Ideal for hunting and range use, the RRA CMPLT MID A4 UPR 450BM 16" 5RD exemplifies Rock River Arms' commitment to quality craftsmanship and innovation.

Key Features:

• Manufacturer: Rock River Arms
• Model: Tactical Carbine
• Caliber: .450 Bushmaster
• Barrel Length: 16"
• Gas System: Mid-Length
• Handguard: RRA 13" Free Float M-LOK
• Brake: RRA Operator Brake, 5/8-32 Thread
• Capacity: 5 Rounds
• Includes: Bolt Carrier Group, Charging Handle Assembly