Spikes STLS029 PHU Spade Stripped Lower Receiver Multi-Caliber 7075-T6 Aluminum Black Anodized for AR-15

The Spikes STLS029 PHU Spade Stripped Lower Receiver is a precision-engineered AR-15 lower forged from 7075-T6 aluminum and finished with black hard-coat anodizing. Built to support multi-caliber configurations, this stripped lower receiver provides the foundation for custom AR platform builds across a range of caliber options. The low shelf design and RDIAS compatibility make this receiver a versatile choice for builders who need a proven platform without compromise.

The 7075-T6 aluminum alloy is the same material specification used in aerospace and defense applications, delivering superior strength-to-weight characteristics compared to standard 6061-T6 aluminum. Black hard-coat anodizing provides corrosion resistance and durability suitable for extended field use and variable environments. The multi-caliber design eliminates the need to source different lower receivers when configuring builds for .223 Remington, 5.56 NATO, .300 Blackout, or other common AR platform calibers. The low shelf configuration accommodates single-stage and two-stage trigger designs without interference. RDIAS (Registered Destructive Device Auto Sear) compatibility indicates this lower will accept post-1986 registered auto sear components where legally permissible.

This stripped lower is designed for experienced AR builders and gunsmiths who are selecting individual components to specification. The PHU Joker logo with spade marking provides a distinctive visual identifier. Completion requires a lower parts kit, buffer tube assembly, and stock—allowing builders to select these components based on intended use, whether for tactical training, precision work, or home defense configuration. The receiver dimensions and weight support standard AR ergonomics and accessory mounting without modification.

Stripped lower receivers serve as the regulated firearm component under federal law and require appropriate licensure and compliance for transfer. This receiver is manufactured to mil-spec tolerances and represents a core component for AR platform customization, offering flexibility for builders who need a proven forging paired with specialized upper assemblies or caliber configurations.