Build your AR platform with the BATTLEARMS WORKHORSE 16-inch 5.56 NATO upper, designed around a dependable Rosco Manufacturing barrel and a lightweight free-float handguard. Its mid-length gas system, 1:7 twist rate, and durable components make this complete upper assembly a versatile foundation for your compatible build.
The 4150 chrome-moly vanadium steel barrel features a nitride finish, 5.56 NATO chamber, M4 barrel extension, and .750-inch gas-block diameter. A low-profile gas block sits beneath the 15-inch WORKHORSE M-LOK free-float rail, while the forged 7075-T6 M4 upper receiver adds strength with a hard-coat anodized black finish and M4 feed ramps. Made in the USA, this assembly arrives with an A2 flash hider installed.
- 16-inch 5.56 NATO barrel with 1:7 twist rate
- Rosco 4150 chrome-moly vanadium steel barrel
- Durable nitride barrel finish; not chrome lined
- Mid-length gas system with low-profile .750-inch gas block
- 15-inch WORKHORSE M-LOK free-float rail
- Forged 7075-T6 M4 upper receiver with M4 feed ramps
- A2 flash hider with 1/2-28 muzzle threads
- M4 barrel extension and A2 barrel profile
- 24.5-inch overall length
- Made in the USA
- Does not include bolt carrier group or charging handle
Choose the BATTLEARMS WORKHORSE upper for a purpose-built 16-inch AR upper assembly with practical M-LOK space and proven specifications. BCG and charging handle are sold separately; confirm compatibility with your intended lower receiver and components before purchase.
