US Patent 8209896 Multi-purpose gunsmithing fixture

A gunsmithing fixture for use with an upper receiver, including an upper portion having an upper body portion, wherein the upper body portion comprises a partially cylindrical portion and a rib portion, and wherein the upper body portion includes a groove formed along the central longitudinal axis of at least a portion of the upper body portion; and a lower portion having a lower body portion, wherein the lower body portion includes a protrusion extending from at least a portion of the lower body portion, wherein the lower body portion comprises a front receiver lug recess and a rear receiver lug recess; wherein the groove of the upper body portion is formed so as to slidably mate with the protrusion of the lower portion, such that the upper body portion can be secured to the lower body portion via slidable interaction of the groove and the protrusion.