The Galil PRO 5.56 jig completely captures the 80% receiver and lays out the locations of the crosspins for the hammer, trigger, autosear, as well as all of the receiver bottom cutouts.  It also includes the different drilling holes for the large or small safety pin hole on the left side of the receiver.  The bottom plate of the jig locates the autosear slot as well as the ejector tang on the 80% milled receiver.