Vltor Modular Upper Receiver 223 Rem/5.56 NATO With Forward Assist Black

Vltor Modular Upper Receiver 223 Rem/5.56 NATO With Forward Assist Black. As a modular upper receiver (MUR) it is made to be a rigid Mil-Spec flat-top upper so that it seamlessly fits with all Mil-Spec AR 15/M4/M16 rifle and carbine lower receivers. Since the MUR is rigid and durable with a thicker wall it can support larger optics and improve your accuracy as the recoil is lessened. With various models you can even customize what you want in an upper receiver. For example the MUR-1A model has a