Semi-auto lower receiver is machined from a 7075 T6 aluminum forging to mil-spec dimensions for precise fit and outstanding performance. Ruggedized hardcoat anodized finish resists scuffs, scratches, and wear. Stamped and color-coded bullet selector position markings notify operator when weapon is in “safe” or “semi-auto.” A “full-auto” position is not selectable but gives this semi-auto lower receiver the appearance of being multi-burst capable. Magazine well features Spike’s spider logo and multi-cal engraving.Complete Lower w/o Buttstock includes trigger/hammer group and all other internal components ready for the receiver extension and buttstock of your choice. Stripped Lower comes as a standalone component without trigger group, mag release, selector, or bolt release.