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Stripped C-5 Gen 1 Billet Lower (MP5 Mag) Specifications and Features of the Stripped C-5 Billet Lower (MP5 Mag): Machined from 7075-T6 aircraft grade billet aluminum Available in Matte black hard-coat Type III anodize or RAW finish Precision machined magazine well with beveled feed lip for easy mag swaps Machined and engraved to be compatible with 45 and 60-degree short throw fire control selectors Compatible with most standard AR-9 components and most aftermarket parts Take down pin spring and detent hole is threaded for a 6-32 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 Threaded bolt catch pin (Threaded hole and hardware) Integrated large opening "winter" trigger guard Proprietary magazine catch assembly, feed ramp, and ejector is included Manufactured to MILSPEC (where applicable) on state-of-the-art CNC equipment for consistent quality parts and exacting tolerances Save money by building your own AR-9 rifle from the ground up exactly the way you want it configured and shoot for less!   **NOTE: You must use an upper that has widening cuts to accept the larger width MP5 Magazines **NOTE: ETS magazines will require slight sanding/filing to achieve a perfect fitment due to variations from factory H&K Magazines. We have yet to find any fitment issues with HK, Zenith, or KCI mags.   FAQ: QUESTION: What type of magazines will fit in this lower? ANSWER: The lower was designed to fit and drop free factory MP5 9mm magazines. It has also been thoroughly tested with many aftermarket magazines to fit and drop free. Although it accepts and shoots other aftermarket magazines (KCI, etc) some slight modification may be needed to get them to drop free from this lower because of the varying width measurement we have seen when checking these magazines to H&K MP5 factory specifications. QUESTION: Do you of