Dedicated AR-15 Lower for use with Glock® magazines. Accepts small frame magazines, such as 17, 19 & 22 mags. Includes magazine release and ejector. Machined from 7075-T6 aluminum. Matte black anodized finish per Mil 8625 Type 3 Class 2. Precision machined mag well with bevelled lip. Machined and engraved for use with 45 and 60 degree safety selectors. "Multi" caliber marking. Compatible with most AR-15 components. Take down pin spring and detent hole is threaded for a 4-40 screw for easy capturing (included). Upper tension screw behind grip screw. Ambidextrous trigger finger rests with grooves. Threaded bolt catch pin (includes pin). Integrated large winter triggerguard. Proprietary magazine catch assembly and included ejector. Lower receiver does not have last round bolt hold open functionality.
Big Book Catalog, Issue:70, Page:008