The operations this jig covers are as follows: Drill Barrel Hole Drill and Tap Barrel Clamp holes Drill Bolt Stop Drill Trigger Assembly holes Drill and Tap Stock retention hole Cleaning Rod Hole (optional) While the tasks are easier to complete with the 80% TM-22 it is extremely critical that the jig and your drill press is level. Do not remove the jig in between operations on the side you're currently working from. This is especially important for the barrel & barrel clamp holes. They must be precisely placed. Also, do not drill all the way through the receiver on he bolt stop & trigger assembly, these are required to be flipped as the drill will walk. Tool Information .188 Drill .250 Drill #16 Drill 12-24 Tap 11/16 Drill 5/16 Drill Extended Reach OAL 6 3/8 You will also need to find a long drill for the charging handle retainer or use a sharpened punch. We recommend sharpening a long punch and hitting it through the barrel hole.