Sharps Bros The Jack Gen2 Billet Lower — AR-15, Multi-Cal

The Sharps Bros The Jack Gen2 is a billet-stripped lower receiver intended for AR-15 platform builds. It is CNC machined from 7075-T6 aluminum and finished with a black hardcoat anodize for durable surface protection. The design is multi-caliber marked and engineered to accept standard mil-spec internal parts and commonly used magazines.

Key Specifications

• Manufacturer: Sharps Bros.
• Model: The Jack (Gen2).
• Product type: Stripped lower receiver for AR-15 platform builds.
• Material: 7075-T6 aluminum, CNC machined.
• Finish: Black hardcoat anodized.
• Weight: 11.1 oz.
• Dimensions: 2.30 x 4.45 x 8.80 inches (listed dimensions).
• Compatibility: Compatible with mil-spec internal parts and aftermarket mil-spec upper receivers, GI magazines and PMags.
• Features: Threaded bolt catch pin, oversized integral trigger guard, and beveled magazine flare.
• Marking: Multi-caliber marked.

This stripped lower provides a solid foundation for a custom AR-15 build, combining billet construction with practical refinements introduced in the Gen2 run. Its compatibility with mil-spec components and common magazine types makes it versatile for a wide range of projects, while the hardcoat anodize helps maintain a low-profile, durable finish. Note: this item requires a lower parts kit, buffer, and stock to complete a functional firearm. This product is not available for sale to Illinois residents under PICA.