DARPA Lugged Rail Inletting Service

This service is limited to cutting the lugged base used on the DARPA XM-3 rifle (and other variants). The purpose of this is to attach the scope base to the receiver in a manner that essentially locks the receiver and base as one piece.  The combination of lug and keyed surfaces deliver an extremely robust and dependable mount.  The screws are essentially left with the sole function of holding the base to the action. The action is modified so that the scope base lug surfaces slip into the registers machined into the receiver. In addition, the ejection port is lengthened and altered to form the double radius feature used on the DARPA XM-3 rifle along the rearward side of the port.  Scope base mount holes are also enlarged to 8-40 on the receiver. All of our work is performed on a 4 axis CNC milling center.  Our tool paths are sourced from original Remington prints. To include detail items such as the subtle alteration of the receiver body along the ejection port between the rear bridge and front ring. Please note that this service is highly specialized and invasive.  We are performing an extensive modification to your action that cannot be undone.  Before committing to this service ensure you know exactly what you are ordering.  Also note that not all "clip slot bases" are equal. They all vary to some degree in how they interface with the action, ours our no different. We recommend you purchase our DARPA style scope base with your action work. See matching DARPA style rail sold separately below. If you are looking to build a USMC rifle clone, Custom Shop also builds complete blueprinted M40A rifles.