Battle Arms Development WORKHORSE 10.5" AR-15 Upper Assembly | .223 / 5.56 NATO

Battle Arms Development WORKHORSE^® 10.5″ AR-15 Upper Assembly | .223 Wylde

The Battle Arms Development WORKHORSE^® 10.5″ AR-15 Upper Assembly is a compact, duty-oriented upper receiver group engineered for shooters seeking reliable performance, modern modularity, and premium component quality in a lightweight short-barreled AR platform. Chambered in .223 Wylde and compatible with both 5.56 NATO and .223 Rem ammunition, this upper assembly delivers excellent versatility for defensive carbines, AR pistols, suppressor-ready builds, and compact range rifles.

At the core of the upper is a 10.5″ 4150 Chrome Moly Vanadium barrel featuring a durable nitride finish for enhanced wear resistance, corrosion protection, and long-term service life. Shooters frequently search for 10.5″ AR-15 uppers because compact barrel configurations provide exceptional maneuverability in confined environments while maintaining strong ballistic performance for defensive and tactical applications.

The .223 Wylde chamber combines the reliability advantages of 5.56 NATO compatibility with the improved accuracy characteristics commonly associated with .223 Rem chambers. Builders frequently search for .223 Wylde AR-15 uppers because the hybrid chamber design safely supports both 5.56 NATO and .223 Rem ammunition while offering enhanced precision potential across a wide range of loads.

A carbine-length gas system paired with a WORKHORSE^® low-profile gas block helps maintain dependable cycling performance in the compact 10.5″ platform. The barrel features a versatile 1:8 twist rate capable of stabilizing a broad range of bullet weights commonly used in defensive, training, and suppressor-ready rifle setups.

The included WORKHORSE^® 9.5″ M-LOK^® free float handguard provides modern modularity and improved accuracy potential while maintaining a slim ergonomic profile favored by today’s AR builders. M-LOK^® attachment slots allow direct mounting of weapon lights, hand stops, sling accessories, lasers, and vertical grips without unnecessary weight or bulk.

The forged 7075-T6 upper receiver features durable hardcoat anodizing and M4 feed ramps for reliable feeding with modern ammunition profiles. An A2 flash hider is included to help reduce visible muzzle flash while maintaining the compact overall footprint ideal for AR pistol and SBR configurations.

This upper assembly does not include a bolt carrier group or charging handle, allowing builders to customize the rifle’s operating system to match their preferred suppressor setup, recoil tuning, or performance goals.

Whether building a compact defensive rifle, AR pistol, truck gun, or suppressor-ready range setup, the Battle Arms Development WORKHORSE^® 10.5″ Upper Assembly delivers premium component quality, reliable performance, and modern free float modularity trusted by serious AR builders.

Features:

• 10.5″ AR-15 upper assembly chambered in .223 Wylde
• Compatible with both 5.56 NATO and .223 Rem ammunition
• 4150 Chrome Moly Vanadium barrel construction
• Nitride barrel finish for enhanced durability and corrosion resistance
• Carbine-length gas system
• 1:8 twist rate for broad projectile compatibility
• M4 barrel extension and M4 feed ramps
• Forged 7075-T6 upper receiver
• WORKHORSE^® 9.5″ M-LOK^® free float handguard
• WORKHORSE^® low-profile gas block
• A2 flash hider with 1/2×28 muzzle threads
• Excellent for AR pistol, SBR, defensive, and suppressor-ready builds
• Made in the USA

Specifications:

• Barrel Length: 10.5″
• Barrel Material: 4150 Chrome Moly Vanadium
• Barrel Finish: Nitride
• Chamber: .223 Wylde
• Twist Rate: 1:8
• Gas System: Carbine-Length
• Gas Block Diameter: .750
• Muzzle Threads: 1/2×28
• Handguard: WORKHORSE^® 9.5″ M-LOK^®
• Upper Receiver Material: Forged 7075-T6 Aluminum
• Overall Length: 18.5″
• BCG Included: No
• Charging Handle Included: No