The Diamondback Firearms DB15 Carbon Series stripped lower receiver is the precision-machined foundation every AR-15 builder needs. This multi-caliber aluminum lower is engineered to accept standard AR-15 fire control groups and lower parts kits, giving you the flexibility to assemble rifles in multiple calibers from a single receiver platform. Whether you're building your first custom AR or adding to an existing collection, a quality stripped lower is where accuracy and reliability begin.
Built from forged 7075-T6 aluminum—the same material spec used in demanding aerospace and military applications—the DB15 is precision-machined to mil-spec dimensions for reliable fit and function with aftermarket and OEM components. The matte black hardcoat anodized finish provides genuine corrosion resistance and durability in the field or at the range, without the fuss of constant maintenance.
The multi-caliber marking on this lower gives builders real practical value. Instead of locking yourself into a single cartridge, you can swap upper assemblies and adapt your rifle to different roles—hunting, target shooting, training, or duty use—without buying multiple lowers. It's a smart investment in versatility that serious builders appreciate.
Diamondback Firearms has built a reputation for delivering solid, no-nonsense receivers at fair prices. The DB15 Carbon Series stripped lower is purpose-built for shooters who want proven quality without paying for branding hype. Pair it with your choice of upper, trigger kit, and furniture to create exactly the rifle you need.
| Material | Forged 7075-T6 Aluminum |
| Finish | Matte Black Hardcoat Anodized |
| Caliber Marking | Multi-Caliber |
| Type | Stripped Lower Receiver |
| Platform | AR-15 |
| Compatibility | Standard AR-15 fire control groups and lower parts kits |
A multi-caliber marked lower receiver is designed to work with multiple AR-15 cartridge configurations. The actual caliber you build depends on the upper assembly you pair with the lower—the lower itself doesn't restrict you to a specific round. This means you can use the same lower with uppers in different calibers, though you'll need to verify your specific upper and ammunition pairing for reliability and safety.
This is a stripped lower receiver, which means it arrives without a fire control group (trigger, hammer, springs, and pins) or other internal parts. You'll need to purchase a lower parts kit or individual fire control components separately to complete the receiver before it can function.
Yes. The DB15 is precision-machined to mil-spec dimensions and is designed to accept standard AR-15 fire control groups and lower parts kits from major manufacturers.
7075-T6 aluminum is an aerospace-grade alloy chosen for its strength-to-weight ratio and durability. It provides the structural integrity needed for reliable firearm operation while keeping the receiver lightweight—a characteristic that builders and shooters value in a modern rifle platform.
Diamondback
Diamondback
Diamondback
