AR Lower Receiver Step-by-Step Chapter 2 9 Begin by clamping the forging to your milling machine table using the passenger side clamping pad. But I will soon give the lower a black anodize finish. This guide will cover using the Optimus Defense Drill Jig to complete your lower. Cutters: These tools are included in the Optimus Defense Drill Jig: 3/8” End-mill with a 3/8” shank 1/4” End-mill with a 3/8” shank 3/8” Stub split tip drill bit 5/32” Jobber split tip drill bit With the right required tools picked out, your project should run smoothly. M1 Machining is the industry standard in high quality AR10 & AR15 lower receivers. (Only one template bolts to the top at a time.) Then indicate the forging true to the x axis. With a good jig and accompanying specialized end mill cutting tool, machining results of the fire control group pocket rivaling CNC mills can be had in your home garage. 5D Tactical supplies essential equipment for building your own AR-15, AR-9 or AR-308/AR-10 firearms, including upper receivers and 80 percent lower receivers, 80% lower jigs, tools, and jig replacement parts. 80% MILLING JIG FOR AR-15/9MM DISCLAIMER: These instructions are intended for use by someone who has knowledge of machining and machine tooling necessary to complete an 80% receiver. of this manual. It is the end user's responsibility to determine if finishing an 80% receiver is permitted by law in their state and/or municipality. ANDERSON MANUFACTURING 80% LOWER RECEIVER JIG -SUGGESTED METHOD- Step #2: Install Template 1 as shown in the picture on the previous page using provided screws. Then install the 115 bit on the Dremel and begin milling. Just be sure to take your time, and always remember to measure twice and cut once. Finishing an 80% AR15 lower is not hard at all. There are plenty of optional tools that'll make machining even easier: 1. 6. Beyond a certain point there is patches of ribbing that are the same color as the lower. Spare End Mill and Drill Bits. 80 LOWER MACHINING MANUALS JMT AR-15 Polymer 80 Machining Instructions. Carbon 50 AR-15 80% Lower; AR-15 80% Polymer Lower; Carbon 50 .308 80% Lower I purchased my eparmory 80% lower … SHOP JMT; JMT PRODUCTS. The CNC jig takes all the guesswork out of finishing this project. • Drill two 5/16” thru holes (one on each end of the trigger hole slot shown below). Ghost Gunner is a general purpose CNC mill that gives you the ability to finish a growing library of mil-spec 80 percent lowers to completion. We have the product line, capabilities, and expertise to assist you in finishing flawless 80 percent lowers. With simple tools and point and click software, the machine automatically finds and aligns to your 80% lower to get to work. More recent than the concept of 80% lower receivers themselves, is the concept of being able to finish machine the lower receiver using only a handheld drill and compact router. As you probably noticed several of the holes in the AR15 lower receiver are not critical at all. 80% Lower: Optional Tools. Chapter 2 The First Setup With forgings (as well as castings and weldments) that require final precision machining, the big problem is where to start. Using the drill press in tandem with a center-cut end mill bit (which is included with the 80% jig you'll purchase for your lower), you can complete the bulk of the fire control cavity using the provided drill bits and pilot hole template, followed by making vertical plunge cuts with the end mill to smooth out the floor of the receiver. 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