Battle Arms Development Workhorse Upper Receiver Assembly for AR-15 – 5.56 NATO, 16 Inch Barrel, Midlength Gas (WH-UR-16-556)

• Upper receiver assembly for AR15 rifles chambered in 223 Remington and 556 NATO
• Includes 16 inch barrel with mid length gas system for balanced operation
• Barrel constructed from 4150 chrome moly vanadium steel with nitride finish
• Equipped with 15 inch M LOK free float handguard for accessory mounting
• Includes A2 flash hider installed on 1/2x28 threaded muzzle
• Does not include bolt carrier group or charging handle components

The Battle Arms Development Workhorse Upper Receiver Assembly is an upper receiver assembly designed for AR-15 rifles chambered in 5.56 NATO and .223 Remington. This assembly features a 16 inch barrel with a mid-length gas system and includes a 15 inch M-LOK free-float handguard with a 1913 Picatinny top rail. It is designed to fit AR-15 lower receivers and functions as a complete upper excluding the bolt carrier group and charging handle.

The Battle Arms Development Workhorse Upper Receiver Assembly uses a forged 7075 T6 aluminum receiver and a 4150 chrome-moly vanadium barrel with a nitride finish. It features a 1:7 twist rate, 1/2×28 threaded muzzle with an A2 flash hider, and a low-profile gas block with a .750 diameter interface. This product is used for assembling or upgrading AR-15 rifles and supports standard configurations for range use. In typical setups, it attaches to compatible AR-15 lower receivers and requires a separate bolt carrier group and charging handle.