Aero Precision M4E1 PRO Complete Lower Receiver 5.56 NATO Semi-Auto, Black - APAR600194

The M4E1 PRO is a complete lower receiver chambered in 5.56 NATO/.223 Remington with semi-automatic action. It features ambidextrous controls including safety, bolt catch, and magazine release, along with an enhanced buffer tube, Magpul MOE grip, and MOE SL carbine stock.