(Only one template bolts to the top at a time.) Or use the Drill Jig to drill each 1/8″ Hole to a little higher than finished depth for the FCG main pocket at 1.250″. The Brownells Pivot Pin Tool Kit makes this step very easy. When using the Modulus jig, you must install a pivot pin in the 80-percent lower. We've made things easier than ever with the release of our Easy Jig® Gen 3! According to the Second Amendment, all U.S. citizens hold the right to bear arms. Dismiss. Handgun, Breaking News: 80% Lowers Under Intense Fire, Company Statement: ATF Raid on Competitor Polymer80. With the pilot holes drilled, the aluminum left in the fire control cavity may then be removed using the same method. Burnt Bronze Cerakote AR-15 Upper and 80% Lower Receiver Set Burnt Bronze Cerakote AR-15 Upper and 80% Lower Receiver Set $ 219.99 $ 169.99 $ 219.99 $ 169.99 Read more. You’re done! You can easily modify a standard AR15 80% jig to machine out your AR9 or AR45 80% lower. Drill entirely through the sides of the receiver via the right side plate. When you press the End Mill down (plunge) into the 80% Lower material, GO SLOW. You’ll cut through the floor of the 80% lower to create a slot for the trigger once done. Once the trigger slot is cut, the receiver’s fire control cavity is finished. The 1911 is an old school hand fit firearm and it shows when you're doing an 80 1911 frame. Check out the product page for videos of how simple it really is, or our instruction manual page to see how simple we have made all of our products. Hand held drills DO NOT work very well at all although there are customers who have reported using one. Add to wishlist. Therefore, be sure to set your drill or mill depth appropriately. In addition to cutting costs, our 80% lower jig puts you in control of the work, letting you ensure the job is done perfectly to finish the receiver for your next build. 80% Lower Receivers, AR15 80 percent lower Jig, AR 15 complete uppers, Rifle and Pistol Kits. You’ll use the end mill bit similar to a drill bit, plunging downward until you reach the 1.375” depth mark. An 80% lower is a receiver blank that is machined as far as you can without legally becoming a frame or receiver and would then require to be transferred to an FFL. • Drill two 5/16” thru holes (one on … Progress Check – when you are done drilling the correct number of 3/8″ holes, your 80% Lower should look like the image above. STEP 6 – Continuing with the jig assembly standing upright, start drilling with the 1/8″ Drill Bit at every hole shown above as Orange. You may now remove the short end bit and first milling template. You’ll cut through the floor of the 80% lower to create a slot for the trigger once done. You’ll want your finished depth of the FCG pocket to be 1.250″. By now, you have the rear shelf, and most of the primary receiver cavity machined. Set the depth to stop precisely 2.000” deep from the face of the template using a stop collar and calipers. In step seven, we’ll return the mill receiver to a 2.000” depth. There is only about 0.070″ of material to cut so you can just mill all the way through to the Trigger Guard area. This jig and these instructions work for any AR-15 (5.56, .223, 300 BLK) and AR9 (9mm) 80% lower. Now, install the long 3/8” end mill bit and bolt the second milling template to the jig. That’s why, to this day, 80 percent lowers have experienced a boom in popularity. STEP 1 – First align either Side Plate to your 80% Lower and insert (2) 1-3/4″ long allen head screws through to fasten all three pieces together – DO NOT tighten yet. Zombie Green Cerakote AR-15 Upper and 80% Lower Receiver Set If you are using a drill press for this step, which is designed to cut vertically solely, consider plunge-cutting, as the included end mill bits are center-cut and, thereby, designed for vertical and lateral cuts. Bolt the plate holder to the jig side plates using the two biggest hex-head bolts included with the setup. Make sure to periodically pull the drill out of the guide hole to clear any chips. To keep the lower receiver within tolerance, pay close attention to the tolerances as you machine. STEP 8 – Attach the Milling Top Plate (as shown above) and continue with the jig assembly standing upright. 308 PARTS. -UFS 80% Lower Receiver Jig Instructions- Please begin by reading this document in its entirety and making sure you have all necessary components and tools. Legally built 80% AR-15 firearms. For the best cut, use shallow, precise movements to remove excess aluminum from the receiver. SHOP 80% LOWER RECIEVERS. Use the 1/4″ End Mill at a mid-range RPM and then slowly trace around the outside perimeter of the small slot in the Drilling Top Plate – Remove the Drilling Top Plate. 5 Ways of Completing an 80% Lower Receiver While the average AR-15 builder may not have access to all the tools mentioned here, he or she should have access to at least one or more. Use the 1/4″ End Mill at a mid-range RPM and do your incremental down steps at about 1/8″. Use the 1/4″ End Mill and SLOWLY press (plunge) the end mill thru the bottom of the FCG pocket. Remember: To avoid misalignment, do not over-tighten the vise. Lubricate the template plate guides and receiver using your machining oil to protect your drill bits. Take your time, follow the instructions, and you're guaranteed a great result. When milling around plate, shaft of end mill is able to hit side, ... AR-10 Gen 1 DPMS Anodized Billet 80% Lower Receiver. 80% AR15/AR10/.308 Lower Receiver Jig Specific Instructions, Video's, Blueprints, Schematics and How to Information. Or use the Drill Jig to drill each 5/32″ hole to a little higher than finished depth for the FCG main pocket of 1.250″. Aluminum lowers are very hard and require more tools and supplies to properly complete. Basically, you need to make Surface A flush with surface B on the diagram. NOTE – You can drill the Selector Hole through, or just start the hole in the side of the Lower and go back later to finish. You can either “start” each hole, and then drill to depth after removing the Top Plate. You’re able to purchase an unfinished lower and complete the build yourself, thereby saving you time and money while avoiding legal hassle. The pins on the plate should rest inside the rear take-down of the AR lower and from the pivot pinholes. STEP 4 – Next, use the 5/32″ Drill Bit to drill both the Hammer Pin Hole and Trigger Hole. Not because of any ridiculous milling requirements but primarily because all of the rest of the fitment after you've completed the frame. With our 80% lower jig, comprehensive instructions and how-to videos, you control production quality by performing the work firsthand. Shipping and Returns, All Shipping Currently At 4-6 Weeks. WarrHogg 308 AR 80% Lower Receiver Instructions Author: Loran Kelley, Polymer80 Co-Founder Warrhogg 308 AR ... milling process. While optional, it’s recommended you keep the following nearby: Furthermore, you’ll need a few end mill bits and drill bits but, depending on the jig you purchase, they are occasionally included in the packaging. The final step, now with the receiver and jig horizontally placed, is to drill the hammer, trigger, and safety pinholes. But how do you actually complete your 80% lower? STEP 3 – Place the jig assembly on its side (Side Plate screw heads UP), and use the 3/8″ Drill Bit to drill the Selector Switch hole. 80% 1911 CLASSIC JIG INSTRUCTIONS DISCLAIMER: These instructions are intended for use by an individual ... milling machine. 0 Please read all of the directions from start to finish before starting any work on your lower. Overview: These instructions are meant to give you some direction in completing your Optimus Defense 80% Lower Receiver. Once the pilot holes are drilled, remove the 3/8” bit and pilot hole plate. Note: your jig will probably not look identical to this, but the concept will work the same. 80% 1911 Frames . STEP 5 – With the jig assembly standing upright, start drilling with the 5/32″ Drill Bit at every hole shown above as Green. You may wish to use a stop collar and calipers to verify the depth, as it must be exact. AR15 PARTS. 80 Percent Lower Receiver Blog, Instructions And Guides For Lowers. Stealth Arms' AR-15 Jig is designed to aid in finishing your AR-15 and 1911 80 Percent Lower Receiver. STEP 10 – Attach the Drilling Top Plate (as shown above) squaring and leveling once again to continue with the jig assembly standing upright. You may remove both the jig and the lower from your vise and position the entire assembly horizontally for further drilling. Since (4) of the 1/8 diameter holes fall on the edge of this 0.250 hole, I drilled the (4) 1/8 holes at … It’s a question that all newcomers ask when they attempt their first rifle build. But for completing an 80 percent lower AR build, you’ll need a few pieces of machinery on hand. ATF Firearm Laws and Information. The goal of finishing the lower receiver is to mill out the following with the assistance of the jig: a. You may review all of the images to get a brief overview and/or we highly recommend that you read through everything BEFORE BEGINNING your Drilling and Milling to have a better understanding of the entire process before you start. Once the trigger slot is cut, the receiver’s fire control cavity is finished. Align both the jig and the lower with the tooling, then drill through the pilot hole guide on the top template plate. A lower parts kit will not even fit in an 80% Lower until it has been machined into a complete firearm. The drill bushings ensure every pin hole is aligned. 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