The Battle Arms Development Workhorse 16-Inch AR-15 Upper Assembly in .223 Wylde (Battle Arms Development part no. WH556-UA-16-223-BLK) pairs a 16.25-inch barrel with a 15-inch M-LOK free-float rail. The 4150 chrome-moly vanadium barrel is nitrided, with a medium A2 profile, a midlength gas system and a 1:8 twist. It wears an A2 flash hider on 1/2-28 threads. The forged 7075-T6 upper is hard coat anodized black and has M4 feed ramp cuts. It ships without a bolt carrier group or charging handle, so it suits a builder who already has those parts.

Key Specifications

• The chamber is .223 Wylde, the designation Battle Arms uses for this barrel.
• The barrel is 16.25 inches long with a medium A2 profile.
• The twist rate is 1:8 right hand, a rate that stabilizes a wide range of bullet weights.
• The gas system is midlength with a .750 low-profile gas block.
• The barrel is 4150 chrome-moly vanadium steel with a nitride finish and no chrome lining.
• The muzzle device is an A2 flash hider on 1/2-28 threads.
• The handguard is a 15-inch M-LOK free-float rail, which frees the barrel and gives room for accessories.
• The receiver is forged 7075-T6 with M4 feed ramp cuts and a hard coat anodized black finish.
• The upper does not include a bolt carrier group or a charging handle, so you supply both.
• Overall length is 24.5 inches, which sets how the assembled upper sits on a lower.

Frequently Asked Questions

Does this upper include a bolt carrier group or charging handle? No. Battle Arms states this upper does not include a bolt carrier group or a charging handle.

What chamber does this barrel have? The chamber is .223 Wylde, with a 1:8 right-hand twist and a 16.25-inch barrel.

What handguard comes on it? It has the Workhorse 15-inch M-LOK free-float rail, with a low-profile .750 gas block under it.

Buy the Battle Arms Workhorse 16-Inch AR-15 Upper Assembly, .223 Wylde, 15-Inch M-LOK Rail, No BCG

This upper is a sound starting point for a 16-inch AR-15 build, with the barrel, gas system and rail already matched. Add your own bolt carrier group and charging handle to finish it. Order it from our Lubbock, Texas gun shop for fast shipping, and browse more AR-15 uppers while you are here.