The M4E1 PRO Lower Receiver seamlessly integrates ambidextrous controls into the M4E1 Lower that allows for the shooter to easily operate the bolt catch magazine release and safety without modifying their dominant firing hand. - INCLUDES: - M4E1 PRO Lower Receiver- Anodized Black - PRO Ambidextrous Safety - EZ Takedown/Pivot Pins - Aero Precision Enhanced Buffer Tube - Magpul MOE Grip - Magpul MOE SL Stock