The Battle Arms Development Workhorse lower receiver (brand part no. WH556-LR-BLK) is a stripped, forged 7075-T6 aluminum AR-15 lower in a hard anodized flat black finish. It is broached for the magazine well and compatible with TDP and mil-standard AR lower parts, so it takes the trigger group, buffer system and stock you already own. Battle Arms Development marks it for multi-caliber builds and for either 90-degree or short-throw safety selectors, and includes the bolt catch pin, the takedown pin detent spring set screw and the receiver tension screw. It is a no-frills foundation for a custom AR build.

Key Specifications

• The receiver is forged 7075-T6 aluminum alloy, a strong, common material for AR lowers.
• The finish is MIL-A-8625F Type III hard anodized flat black, which resists wear and corrosion.
• The lower is compatible with TDP and mil-standard AR lower parts, so standard parts kits fit.
• The magazine well is broached, which helps magazines seat cleanly.
• The selector markings are pictographs for 90-degree or short-throw safeties, so you can choose the safety style you prefer.
• The lower carries multi-caliber markings, which fits a range of AR builds.
• An easy-install set screw bolt catch pin is included, which simplifies the bolt catch install.
• A captured takedown pin detent spring comes with a 4-40 set screw, which keeps the spring in place.
• The upper and lower receiver tension screw is included, which tightens up fit with the upper.
• The lower weighs 8.22 ounces and is made in the USA.

Frequently Asked Questions

Is the Workhorse lower stripped or complete? It is a stripped lower, so you add your own trigger group, lower parts kit, buffer system and stock.

Which lower parts fit the Workhorse? It is compatible with TDP and mil-standard AR lower receiver parts.

What comes in the box? The lower includes the bolt catch pin, the captured takedown pin detent spring with its 4-40 set screw and the receiver tension screw.

Buy the Battle Arms Development Workhorse Forged Stripped Lower Receiver, AR-15, Black Anodized

If you are building an AR on a budget but want a forged, American-made lower, the Workhorse is a solid starting point. Order it from our Lubbock, Texas gun shop for fast, insured shipping to your FFL, and browse more AR-15 lowers while you are here.