The Jacob Grey JG15 billet lower receiver is a precision foundation for builders who demand fit, finish, and repeatable performance. Machined from billet material to tighter tolerances than cast or forged alternatives, the JG15 offers a solid, refined platform for duty, competition, or range builds. Its black hardcoat finish provides durable corrosion and wear resistance while the refined control cuts and ergonomically minded profile make installation and handling intuitive.