The Battle Arms Development Workhorse Lower Receiver (part no. WH556-LR-BLK) is a stripped, black anodized AR-15 pattern lower built to fit AR-15, M16, and M4-pattern parts and uppers. Battle Arms Development designs the Workhorse line for builders who want a dependable, no-nonsense receiver without extra billet flourishes. It is multi-caliber compatible, accepting standard AR-15 pattern uppers regardless of chambering, and ships stripped so builders can choose their own lower parts kit, buffer, and stock.

Key Specifications

• Part of Battle Arms Development’s Workhorse receiver line.
• Finished in black anodized for a durable, standard AR-15 look.
• Compatible with AR15, M16, and M4 pattern parts and uppers.
• Multi-caliber compatible with standard AR-15 pattern uppers.
• Built to Semi-Auto AR-15 pattern specifications.
• Ships as a stripped lower receiver, ready for your parts kit and stock.
• Machined with a broached magazine well and pictograph selector markings for easy configuration ID.
• Includes an enhanced magazine release and one-piece magazine catch for faster reloads.
• Marked for either 90-degree or short-throw safety selectors.

Frequently Asked Questions

What platforms does this lower fit? It is compatible with AR15, M16, and M4-pattern parts and uppers.

Does it include the lower parts kit? No, it ships stripped and requires a separate parts kit, buffer, and stock.

What calibers can I build with it? It is multi-caliber compatible with standard AR-15 pattern uppers.

Buy the Battle Arms Development Workhorse Lower Receiver

Build on a dependable Battle Arms Development receiver. Browse more AR-15 lower receivers and order from our Lubbock, Texas gun shop for fast, insured shipping to your FFL.