Grey Ghost Precision Cornerstone Forged Lower Receiver

The Grey Ghost Precision Cornerstone is a forged AR lower receiver intended as the foundation for a custom build. It is machined to tighter-than-Mil-Spec tolerances from 7075-T6 aluminum and finished in black hardcoat anodize for durable corrosion resistance. The receiver includes design features such as a nylon-tipped tensioning screw and a flared mag well to aid installation and handling.

Key Specifications

• The receiver is machined from 7075-T6 aluminum.
• This unit is sold as a stripped lower receiver and requires a lower parts kit, buffer, and stock to complete.
• The finish is a black hardcoat anodized surface treatment.
• Designated as Multi-Caliber in the manufacturer attributes.
• The model name is Cornerstone.
• The receiver is listed with an Semi-Auto action attribute.
• Includes a nylon-tipped tensioning screw to improve the fit between upper and lower.
• Features a flared mag well for easier magazine insertion.
• Marked with pictogram safe and fire indicators and chevrons on the front of the mag well.
• The lower is reported to function with nearly all available AR parts kits and uppers.

The Cornerstone lower provides a precise, durable starting point for a wide range of AR builds—sporting, competition, or general-purpose rifle projects. Machined to tight tolerances and finished for durability, it offers the core features builders expect while leaving final parts selection and configuration to the user.