New Frontier Armory C-4 AR15 Lower Receiver. Machined from aircraft grade Billet Aluminum, not forged and compatible with all standard AR-15 components and magazines. Machined with enhancements such as:    Machined from 7075-T6 aircraft grade billet aluminum    Matte black hard-coat anodized per Mil 8625 Type 3 Class 2    Precision broached magazine well with beveled feed lips    Machined and engraved to be compatible with 45 and 60 degree short throw    fire control selectors such as the BAD_ASS ST 45 Lever    Caliber marking of "Multi" so it can be used with many different caliber    uppers    Compatible with all standard AR-15 components and magazines and most    aftermarket parts    Take down pin spring and detent hole is threaded for a 4-40 set screw for    easy capturing (hardware included)    Upper tension screw behind grip screw (threaded hole with hardware    included) to adjust any “slop” out of vertical fit between upper and lower    Ambidextrous trigger finger rests with grooves (above and below mag    release / mag catch)    Compatible with Norgon and other aftermarket ambidextrous mag releases    Threaded bolt catch pin (Threaded hole and hardware)    Integrated large opening "winter" trigger guard    Manufactured to MILSPEC on state of the art CNC equipment for consistent    quality parts and exacting tolerances    Save money by building your own AR-15 rifle from the ground up exactly the    way you want it configured

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