CMMG, Inc MOD4SA semi-auto AR15 forged lower receiver with internal parts and stock. Lower is mil spec and uses standard take-down and fire control pins. Receiver is mil-spec hard coat anodized aircraft grade 7075 T6 aluminum and is Teflon coated for added durability and color consistency. Internals are semi-auto mil-spec. Receivers are RDIAS/RLL compatible.