Dbf Db15 Lower Rcvr Multi Cal Blk

The Diamondback Firearms DB15 Lower Receiver Multi-Caliber in Black is a stripped, forged aluminum lower receiver engineered as the foundation for custom AR-15 platforms. This multi-caliber lower accepts the widest range of upper assemblies in the AR ecosystem, enabling builders to configure 5.56 NATO, .223 Remington, 9mm, .300 Blackout, and other compatible cartridges without purchasing multiple lowers. The matte anodized black finish provides corrosion resistance suitable for both indoor range sessions and field conditions.

Constructed from forged aluminum, this DB15 lower meets mil-spec tolerances and delivers the dimensional accuracy required for reliable cycling and bolt carrier group engagement. Stripped configuration means no fire control group, safety selector, or buffer tube is installed—allowing builders complete customization of trigger type, selector style, and stock system to match their specific requirements. The compact receiver footprint (5.5 x 3.25 x 10.5 inches) and lightweight profile (0.88 lbs) integrate seamlessly into SBR platforms, 300 Blackout subsonic builds, and full-length rifle configurations alike.

This lower receiver addresses the needs of AR platform builders, gunsmiths, and operators seeking a versatile foundation capable of hosting multiple upper configurations. Whether building a precision rifle, compact patrol carbine, or suppressed specialty platform, the multi-caliber design eliminates the need for caliber-specific lowers. Diamondback Firearms positions this stripped lower as an economical component for serious enthusiasts committed to assembling a functional, reliable AR system tailored to their exact operational or training requirements.