ENGRAVED NUMBERED RAILS MODEL: M14REN The M14REN is a rail engraved number service. Whether you currently own an EBR Chassis or are purchasing a new one, engraved numbers on all four axis of the Picitanny rail sections can be achieved by ordering the M14REN service. Allow accessories/optics to be attached at the same point after removal Failure to use the same slot can result in point of impact shifts