The Diamondback Firearms DB15 Diamond Series Stripped Lower Receiver (part no. DB2228R001) is forged from 7075-T6 aluminum and built as a dependable base for AR-15 pattern builds chambered in .223, 5.56, or .300 Blackout. Diamondback finishes this receiver in black and machines it to the same standards found across its DB15 rifle line, so builders get a proven mil-spec platform without buying a complete rifle. It ships stripped, giving full control over trigger, buffer, and stock selection.

Key Specifications

• Forged from 7075-T6 aluminum for a strong, mil-spec receiver.
• Finished in black to match standard DB15 builds.
• Multi-caliber compatible, supporting .223, 5.56, and .300 Blackout uppers.
• Part of Diamondback’s Diamond Series lineup of DB15 components.
• Ships as a stripped lower receiver, ready for your parts kit and stock.
• Weighs approximately 1.05 pounds bare.
• Built to Semi-Auto AR-15 pattern specifications.
• Includes an integral trigger guard and mil-spec-compatible fire control pocket for standard lower parts kits.
• Chambered for .223 Remington, 5.56 NATO, and .300 Blackout uppers.

Frequently Asked Questions

What calibers does this lower support? It is multi-caliber compatible, including .223, 5.56 NATO, and .300 Blackout AR-15 pattern uppers.

Does it come with internal parts? No, it ships stripped and requires a lower parts kit, buffer, and stock.

Is this the same quality as a complete Diamondback rifle? Yes, it is machined to the same standards used across Diamondback’s DB15 line.

Buy the Diamondback DB15 Diamond Series Stripped Lower Receiver

Start your build on a proven Diamondback Firearms receiver. See more AR-15 lower receivers and order from our Lubbock, Texas gun shop for fast, insured shipping to your FFL.