Aero Precision M4E1 Threaded Receiver 5.56x45mm NATO Receiver for AR-15
Product Features & Specifications Aero Precision APAR700201C M4E1 Threaded Receiver 5.56x45mm NATO 7075-T6 Aluminum Black Anodized Receiver for AR-15 The M4E1 Threaded Upper Receiver features an angular machined design that helps it stand apart from standard mil-spec upper receivers. It is threa
