This stock adaptor allows the mounting of an M4 push-on tube and will accommodate most M4/M16 stocks currently produced. It provides a unique way of customizing The EVO 3 A1, while still retaining the ability to fold to the side for transportation or operations in confined spaces. The mounting bracket is made from CNC machined aluminum for unsurpassed strength and durability. It comes assembled and ready for installation, simply attach a push-on stock tube and tighten its mounting screw inside the tube.