The Diamondback Firearms DB15 Diamond Series stripped lower receiver is a precision-machined foundation for custom AR-15 builds. Built from forged 7075-T6 aluminum with black hardcoat anodizing, this multi-caliber lower gives you the durability and compatibility you need to assemble a rifle tailored to your shooting discipline—whether you're building a hunting rig, a range gun, or a dedicated competition platform. The "Black/Gold Series" designation means upgraded internal component finishes that resist wear through thousands of rounds, so you're starting with a solid, long-lasting base rather than compromising on metallurgy.
As a stripped lower, this receiver arrives without fire control group, stock, or buffer hardware—giving you complete control over how you finish the build. That flexibility is why builders choose stripped lowers: you're not paying for parts you don't want, and you can spec the trigger, ergonomics, and controls exactly as you prefer. The DB15 is machined to mil-spec dimensions and works seamlessly with standard AR-15 components, so sourcing parts is straightforward and your options are unlimited.
Diamondback designed this multi-caliber lower to handle cartridges across the AR platform—.223 Rem, 5.56 NATO, and beyond—so one receiver can become multiple guns over time. The forged aluminum construction keeps weight down without sacrificing rigidity, and the hardcoat anodize handles the wear and tear of the range, field, or competition environment. Whether you're assembling your first AR or your tenth, the DB15 Diamond Series delivers the precision and reliability Diamondback is known for.
| Platform | AR-15 |
| Caliber Marking | Multi-Caliber |
| Material | Forged 7075-T6 Aluminum |
| Finish | Black Hardcoat Anodized |
| Series | Black/Gold |
| Configuration | Stripped Lower Receiver |
This is a multi-caliber lower receiver designed for the AR-15 platform, meaning it's compatible with standard AR-15 calibers including .223 Remington and 5.56 NATO, as well as other AR platform cartridges. The specific caliber you build is determined by your upper receiver and barrel selection.
Yes. The DB15 is machined to mil-spec dimensions and accepts standard AR-15 fire control components, stocks, buffer tubes, and other common AR parts. Compatibility with aftermarket and OEM components is straightforward.
This is a stripped lower receiver—it includes the aluminum receiver only. You'll need to source and install a fire control group (hammer, trigger, disconnector), stock assembly, buffer tube, and other components to complete your build.
7075-T6 is an aerospace-grade forged aluminum alloy that delivers superior strength-to-weight ratio. It resists deformation under stress and maintains dimensional stability through extended use, making it ideal for a precision receiver that will handle the repeated stresses of firing and component cycling.
Diamondback
Diamondback
Diamondback
