The 17 Design & Manufacturing AR15 Stripped Forged Lower Receiver is the perfect base for your AR15 build. Machined to mil-spec dimensions, their lowers work with standard AR15 components and ensure the highest quality and parts interchangeability. Forged 7075-T6 aluminum Black hardcoat anodized Mil-Spec dimensions Stripped Receiver Mfg: 17 Design And Manufacturing