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 Multi-Caliber 7075-T6 Aluminum Black Anodized for AR-15 is the foundational component every serious AR builder requires. This stripped lower receiver serves as the legally regulated firearm component that transforms raw parts into a functioning platform, making it essential for gunsmiths, armorer teams, and tactical shooters who demand precision and reliability. The "PHU" designation—Phantom Upper Housing—indicates compatibility with Spikes' engineering standards for multi-caliber upper assemblies, giving builders maximum flexibility across 5.56 NATO, .223 Remington, 300 Blackout, and other popular AR calibers.

Machined from 7075-T6 aluminum alloy—the same grade used in aerospace and military applications—this lower receiver delivers superior strength-to-weight performance compared to standard 6061 alloys. The black hard-anodized finish provides corrosion resistance and operating durability under harsh field conditions, essential for duty weapons exposed to moisture, salt spray, or desert environments. At 0.74 lbs and measuring 4.5 × 2.5 × 8.7 inches, the compact profile integrates seamlessly into modern tactical builds while maintaining the tight tolerances required for consistent reliability across thousands of rounds.

Law enforcement armorers, military weapon custodians, and competitive shooters benefit most from this platform's versatility and quality construction. Because it ships stripped—without fire control group, stock, or trigger assembly—buyers retain complete control over component selection, allowing customization for specific mission profiles or individual ergonomic preferences. Installation requires basic AR gunsmithing knowledge and standard tools; compatibility with all standard AR-15 upper receivers and most aftermarket parts makes this lower receiver an ideal choice for builders seeking a proven, multi-caliber foundation for duty or tactical applications.