Patent ID: 8572884
Filing Date: 2013-11-05
Classification: F41A,F41C

Abstract:
1. A surrogate lower receiver for a rifle for use during removal and installation of hand guards on the rifle using a hand guard removal tool, the rifle having an upper receiver that includes a retractable slip ring, a front lug having a lateral pivot pin hole, and a rear lug having a lateral take down pin hole, and the hand guard removal tool having an engagement flange, the surrogate lower receiver comprising: a mounting bar that is channel shaped with the channel having left and right walls that are spaced apart to fit the front lug and the rear lug, and a bottom, the mounting bar walls further comprising (i) laterally opposing left and right front retainer holes and laterally opposing left and right rear retainer holes, wherein the left and right front retainer holes and the left and right rear retainer holes are longitudinally spaced to match the distance between the pivot pin hole and the take down pin hole, and (ii) laterally opposing left and right front axis holes; and a hook channel having laterally opposing left and right hook axle holes and a lateral stop edge; a pair of retainer pins, wherein the hook channel is pivotally attached to the mounting bar via a front axis member that is laterally positioned in the left and right walls of the mounting bar through the left and right front axis holes and the left and right hook axle holes to form a lateral revolute joint such that in a closed position the hook channel is nested against the bottom of the mounting bar and in a deployed position the hook channel is rested by the stop edge substantially perpendicular to the bottom of the mounting bar and away from the upper receiver, and during use to retract the slip ring, the mounting bar is attached to the upper receiver via a first of the retainer pins laterally positioned through the left and right front retainer holes and the pivot pin hole and a second of the retainer pins laterally positioned through the left and right rear retainer holes and the take down pinhole, the hook channel is rotated to the deployed position, and the engagement flange is engaged in the hook channel such that the slip ring is retracted.