Spikes STLS024 PHU Joker Stripped Lower Receiver Multi-Caliber 7075-T6 Aluminum Black Anodized for AR-15

The Spikes STLS024 PHU Joker Stripped Lower Receiver Multi-Caliber 7075-T6 Aluminum Black Anodized for AR-15 is a precision-machined firearm component engineered for shooters and gunsmiths who demand reliability and versatility in their platform builds. As a stripped lower receiver, this component serves as the registered firearm foundation and hosts the trigger group, hammer, and fire control assembly, making it the critical serialized element of any AR-15 configuration. Whether you're assembling a dedicated competition rifle, a modular duty weapon, or a multi-caliber test platform, the Spikes Joker lower delivers the durability required by law enforcement armorer standards and combat-proven field applications.

Manufactured from 7075-T6 aluminum—an aerospace-grade alloy prized for strength-to-weight ratio—this lower receiver achieves a lightweight 0.7 lbs while maintaining the rigidity necessary to maintain zero and withstand repeated dry-fire and live-fire cycles without dimensional drift or cracking. The black hard-anodized finish provides corrosion resistance and protects against salt spray, sweat, and environmental contamination during extended field operations or storage in variable climates. The multi-caliber designation confirms that this lower accepts upper assemblies chambered in 5.56 NATO, .223 Remington, 6.8 SPC, and other AR-pattern cartridges, eliminating the need for multiple lowers when transitioning between calibers.

Armorers, gunsmiths, and individual builders will appreciate the precision tolerances and clean machining that simplify trigger-group installation and eliminate the need for post-purchase finishing. The stripped configuration allows full customization of the fire control assembly, enabling selection of match-grade triggers, ambidextrous safety selectors, and proprietary hammer designs tailored to mission requirements. Compatible with standard AR-15 parts kits and any MIL-SPEC or commercial upper receiver, the Spikes Joker lower integrates seamlessly into both duty builds and recreational systems.