A firearm support for a firearm having an elongate sling extending along the firearm with two opposite ends attached in spaced relationship to the firearm between a stock end and a barrel end. The inspection fixture signals a processor that the finished part has passed or failed. Each linear segment of one edge is substantially parallel to a corresponding segment of the opposite edge, such that the two edges are substantially complementary in shape, whereby the pouch as a whole has a zigzag shape. The multiple connectors being flattened in the cable and defining a pair of receptacles. A gradation conversion ratio of at least one gradation conversion circuits of the plurality of gradation conversion circuits is different from the gradation conversion ratios of the other gradation conversion circuits. The bone mill further includes a rotatable grinding member, wherein the rotatable grinding member has a substantially cylindrical, rod-like shape, with at least a portion of the rotatable grinding member substantially filling or occluding a portion of the linear passage.