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″. Then slowly trace around the outside perimeter of the smaller slot in the Milling Top Plate MAKING SURE that you have some “shank” (non-cutting surface) of the End Mill ALWAYS running against the slot walls. When you press the End Mill down (plunge) into the 80% Lower material, GO SLOW. 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. By now, you have the rear shelf, and most of the primary receiver cavity machined. You want the right side faced. You may remove both the jig and the lower from your vise and position the entire assembly horizontally for further drilling. No Problem. You’re able to purchase an unfinished lower and complete the build yourself, thereby saving you time and money while avoiding legal hassle. Instructions; 80% Lower Receivers for AR-15 & AR 308 Rifles admin 2017-10-17T23:47:59-07:00. Add to wishlist. If you wish, you may coat the interior of the receiver to better protect the now-raw aluminum showing through. 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. To use the Modulus Arms jig, you must first install a pivot pin in the 80-percent lower. Drill entirely through the sides of the receiver via the right side plate. Hand held drills DO NOT work very well at all although there are customers who have reported using one. A heavy duty drill press may be sufficient, but NOT recommended, as the spindle may not be able to hold tolerances. Lubricate the template plate guides and receiver using your machining oil to protect your drill bits. 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. Of course IT IS from a Federal Law standpoint as well as our 2A but the local governments can also be a serious road block to happiness. 80% Lower Receivers, AR15 80 percent lower Jig, AR 15 complete uppers, Rifle and Pistol Kits. AR-15 Jig Kit Milling Directions | … 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. Proudly Made in the United States of America, ​How to Build An 80% Lower: Beginners Guide. Handgun, Breaking News: 80% Lowers Under Intense Fire, Company Statement: ATF Raid on Competitor Polymer80. Free shipping available with select purchases. Using the 5/32” drill bit, finish the hammer pin hole, trigger, and disconnector pinhole. Using the left jig plate, secure the opposite side and stand the lower up vertically. – We’re pretty sure that everybody knows this already but we have to make the statement that if you choose to finish your 80% Lower into a functioning Rifle part, but FIRST check with your state and local laws to make sure that it is legal to do so. Specifically, which routers are best for finishing an 80% AR-15 or AR-308 lower receiver with our Universal Router Jigs. With the tools you need on-hand, it’s time to tackle your first 80% lower build. In step seven, we’ll return the mill receiver to a 2.000” depth. We mentioned you might want machining oil nearby for lubrication. Make sure to periodically pull the drill out of the guide hole to clear any chips. Shipping and Returns, All Shipping Currently At 4-6 Weeks. (Only one template bolts to the top at a time.) 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. You’ll want to drill precisely 2.000” deep from the top. 80% Lower Receivers for AR-15 & AR 308. You can easily modify a standard AR15 80% jig to machine out your AR9 or AR45 80% lower. You’ll wish to let the shaft of the bit ride the interior shape of the plate to ensure an appropriate cut. Set the depth to stop precisely 2.000” deep from the face of the template using a stop collar and calipers. By now you've caught on to the fact that using an 80% lower receiver to build your new AR-15 or other rifle or pistol is probably the best approach: You're skipping the background check and NICS fees, the transfer fees and special taxes, and you're avoiding the branded premium prices. Therefore, be sure to set your drill or mill depth appropriately. Overview: These instructions are meant to give you some direction in completing your Optimus Defense 80% Lower Receiver. 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. Progress Check – when you remove the Drilling Top Plate, your 80% Lower should look like the image above. You’ll cut through the floor of the 80% lower to create a slot for the trigger once done. The goal of finishing the lower receiver is to mill out the following with the assistance of the jig: a. STEP 2 – Then attach the Drilling Top Plate and use (2) short 10-24 allen head screws to secure the plate leaving bolts loose once again. With our 80% lower jig, comprehensive instructions and how-to videos, you control production quality by performing the work firsthand. 80% AR15/AR10/.308 Lower Receiver Jig Specific Instructions, Video's, Blueprints, Schematics and How to Information. Of course IT IS from a Federal Law standpoint as well as our 2A but the local governments can also be a serious road block to happiness. The final step, now with the receiver and jig horizontally placed, is to drill the hammer, trigger, and safety pinholes. These various ways of completing an 80% lower receiver will help you understand what you need or can use to complete your 80% lower. You can either “start” each hole, and then drill to depth after removing the Top Plate. One of the most modified parts is the lower receiver and there is a whole sub-market of 80% lower … Note: your jig will probably not look identical to this, but the concept will work the same. For step three, you’ll now install the pilot hole drilling template using the two included countersunk hex-head bolts in the jig package. You may wish to use a stop collar and calipers to verify the depth, as it must be exact. But for completing an 80 percent lower AR build, you’ll need a few pieces of machinery on hand. For the best cut, use shallow, precise movements to remove excess aluminum from the receiver. STEP 9 (Optional) – Reattach the Milling Top Plate (as shown above) and continue with the jig assembly standing upright. • Drill two 5/16” thru holes (one on … Use the 3/8″ End Mill at a mid-range RPM and start milling the small section between the FCG main pocket and upper Lug pocket going to a total depth of 0.630″. With the pilot holes drilled, the aluminum left in the fire control cavity may then be removed using the same method. Tags: 80% Lower Receiver Guide, 80% Lower Receiver Instructions, Build An AR Rifle, Rifle Kit, Privacy Policy Using a milling machine is preferred, but a hand grinder or Dremel tool will also work. Sale! Now, install the long 5/16” end mill bit and bolt the last template plate, marked “5/16” EM Thru Bottom,” to the jig. Additionally, after the milling is completed, the build process seems to be where most people get into trouble, particularly during assembly and cleaning. Use the Drill Press to drill each 3/8″ Hole to a little above finished depth for the FCG main pocket at 1.250″. Apply light pressure with the clamp to ensure the jig does not move during the process. As outlined in the 80% lower jig instructions, don’t start the drill until you’re sure the bit is fully inserted. Rated 5.00 out of 5 $ 105.00 – $ 110.50; Top rated products. quality AR15 lower products. Legally built 80% AR-15 firearms. To do this, you need a pivot pin, a pivot pin detent and a pivot pin detent spring. We’re ghost gun owners who love our weapons and after milling and owning just about every 80% AR-15 lower on the market, we decided there had to be a better way. Home Defense: AR-15 vs. This step does not require precise measurements. We provide all the jigs and tools necessary to complete 80 percent lowers! We've made things easier than ever with the release of our Easy Jig® Gen 3! 80 Percent Lower Receiver Blog, Instructions And Guides For Lowers. Apply WD-40 when necessary. You can either “start” each hole, and then to drill to depth after removing the Top Plate. Replace the plate with the included milling template, marked “3/8 EM 1.375 Deep From This Face.”. Carbon 50 AR-15 80% Lower; AR-15 80% Polymer Lower; Carbon 50 .308 80% Lower The first template is typically marked with “3/8 DR 2.00 Deep From This Face.” Next, tighten the jig and lower it into your vise for further machining. Progress Check – when you remove the Milling Top Plate, your 80% Lower should look like the image above. TAKE YOUR TIME and be sure of each cut (check twice, cut once), and use the Drill Jig more as a “Point Guide” than a Jig and you will be able to use it several times if you like. 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. Manufacturing 80% Lowers Since 2009 308 PARTS. 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. What follows is the detailed process (one of many available) to finish your AR15 or AR10 80% Lower Receiver into a ready to use part. Once the pilot holes are drilled, remove the 3/8” bit and pilot hole plate. 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. 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 … You’re done! SHOP 80% LOWER RECIEVERS. Not because of any ridiculous milling requirements but primarily because all of the rest of the fitment after you've completed the frame. If you find burs or rough patches, polish and lightly mill them. With the jig secure, it’s time to install the template plate holder. 80% 1911 CLASSIC JIG INSTRUCTIONS DISCLAIMER: These instructions are intended for use by an individual ... milling machine. Start drilling with the 3/8″ Drill Bit at every 1/8″ hole shown above as Blue. SHOP JMT; JMT PRODUCTS. Always remember to wear proper PPE Now, replace the original 3/8” drill bit with the short 3/8” end mill bit. This instructional guide's shows you how to complete an 80% lower using the Elite Builder 80% Jig and a basic drill press or mini-mill. When milling around plate, shaft of end mill is able to hit side, ... AR-10 Gen 1 DPMS Anodized Billet 80% Lower Receiver. But since the founding of the Constitution, we’ve witnessed countless caveats come into play, along with immense difficulty in purchasing or selling firearms throughout the country. The goal of finishing the lower receiver is to mill out the following with the assistance of the … 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. Set your down steps to about 1/8″ and when you press the End Mill down (plunge) into the 80% Lower material, GO SLOW. Your 80% lower is now ready for assembly. Remember: Do not remove the template holder from the top of the jig. ATF Firearm Laws and Information. 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. that once you Keep in mind start drilling, milling, or altering your 80% lower it becomes a … 80% 1911 CLASSIC JIG INSTRUCTIONS . Left and Right side fixture plat Skeletonized AR-10 .308 80% Lower with Jig Kit, Skeletonized DPMS LR 308 80 Percent Lower with Jig Kit, Skeletonized Billet AR-15 80% Lower with Jig Kit, Raw SR25 AR-10 .308 80% Lower with Jig Kit, Cerakote LR-308 DPMS .308 80% Lower Receiver, AR-15 Rifle Kit 5.56 M4 16" / Chrome-Lined, Skeletonized Raw DPMS LR-308 80% Lower Receiver, Cerakote SR25 AR-10A .308 80% Lower Receiver, Blemished AR-15 80 Percent Lower Receiver, Black Anodized DPMS LR-308 80% Lower Receiver. You may now remove the short end bit and first milling template. Once again, you can either drill through or just “start” those holes, and drill from both sides later. You’ll cut through the floor of the 80% lower to create a slot for the trigger once done. The first step in completing your new AR build is to secure the lower in the right side jig plate. The Brownells Pivot Pin Tool Kit makes this step very easy. Once you have your 80% lower receiver and jig, there are some extra items you will need to round-up to make sure you have a successful build. Tighten all fasteners starting with Side Plate screws. Instructions to complete using a milling machine. Besides the following list of Drills and Mills which is available as our standard Tool Kit, you would be best served to use a free-standing Drill Press to complete your Lower. Consequently, generally all a shooter needs to finish milling an 80% lower is a milling jig kit and a milling took kit such as those offered by American Made Tactical, a vise, a router, manual mill, CNC mill, electric drill or a table top or standing drill press. According to the Second Amendment, all U.S. citizens hold the right to bear arms. Find the highest quality 80 percent lower receivers, receiver jigs & receiver build kits for your AR-15 at the most competitive prices right here at RightToBear.com. But how do you build an 80% lower? The 1911 is an old school hand fit firearm and it shows when you're doing an 80 1911 frame. Stealth Arms' AR-15 Jig is designed to aid in finishing your AR-15 and 1911 80 Percent Lower Receiver. STEP 5 – With the jig assembly standing upright, start drilling with the 5/32″ Drill Bit at every hole shown above as Green. 80% 1911 Frames . NOTE – Be very careful NOT to go too deep. It is only intended to be used as an actual Drilling Jig just ONCE. Then slowly trace around the outside perimeter of the smaller slot in the Milling Top Plate MAKING SURE that you have some “shank” (non-cutting surface)of the End Mill ALWAYS running against the slot walls – Remove the Milling Top Plate. STEP 2 – Then attach the Drilling Top Plate and use (2) short 10-24 allen head screws to … It is the end user's responsibility to determine if finishing an 80% receiver is permitted by law in their state and/or municipality. Terms and Conditions Probably the most difficult of the 80% lowers to convert to a working firearm is the 1911. Use the 1/4″ End Mill at a mid-range RPM and do your incremental down steps at about 1/8″. Basically, you need to make Surface A flush with surface B on the diagram. Begin drilling while making sure that the drill bit is kept straight and perpendicular to the receiver. 0 When using the Modulus jig, you must install a pivot pin in the 80-percent lower. Get assembly instructions here. You’ll use the end mill bit similar to a drill bit, plunging downward until you reach the 1.375” depth mark. Compare. Quick View; AR-15 80% Lowers, AR-15 Uppers. We stand behind all our products and we’re here to support you. Sitemap You may remove both the jig and the lower from your vise and position the entire assembly horizontally for further drilling. 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. The drill bushings ensure every pin hole is aligned. Throughout this process, apply copious amounts of machining oil to the end mill bit and the template plate. Don't overthink it, we've made it very easy. That’s why, to this day, 80 percent lowers have experienced a boom in popularity. Everything You Need To Build An 80% Lower Receiver . Hendricks AR15 PARTS. Once the trigger slot is cut, the receiver’s fire control cavity is finished. Take your time, follow the instructions, and you're guaranteed a great result. For greater accuracy, we recommend installing the drill stop collar along the shaft of the bit and use the digital calipers to verify the depth at 1.375” precisely from the template plate. But how do you actually complete your 80% lower? We recommend to drill each side separately by flipping the Drill Jig assembly over to the opposite side. Our live inventory system means if you can add it to your cart, it's yours! Proudly Made in the United States of AmericaProudly Made in the United States of America, Monday-Thursday 12pm to 4pm PST Closed Friday, Saturday, & Sunday. Instructions to complete using a drill press. There is only about 0.070″ of material to cut so you can just mill all the way through to the Trigger Guard area. You’ll want your finished depth of the FCG pocket to be 1.250″. The jig package included a 3/8” drill bit, which you’ll now want to install on your drill press or milling machine. You’ll require this bit for the safety lever pinhole. 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. Complete 80% Jig Kit is all you need to complete the final machining process to turn your 80% AR-15 Receiver into a working stripped lower receiver. Zombie Green Cerakote AR-15 Upper and 80% Lower Receiver Set 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. Do these instructions look confusing, or you just aren't sure what they mean? 80 LOWER MACHINING MANUALS JMT AR-15 Polymer 80 Machining Instructions. Some leave it bare, however. LEGAL – We’re pretty sure that everybody knows this already but we have to make the statement that if you choose to finish your 80% Lower into a functioning Rifle part, but FIRST check with your state and local laws to make sure that it is legal to do so. This new plate includes a smaller interior guide and says “3/8” EM 2.00 Deep From This Face.”. The three side holes for the pins, on each side of the receiver. STEP 4 – Next, use the 5/32″ Drill Bit to drill both the Hammer Pin Hole and Trigger Hole. 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. Arms and other 80% lowers using only a drill press and a few common tools. STEP 10 – Attach the Drilling Top Plate (as shown above) squaring and leveling once again to continue with the jig assembly standing upright. STEP 7 – Continuing with the jig assembly standing upright and the Drilling Top Plate removed. Check out the easy instructions on how to finish an 80% lower receiver. Each instruction spelled out below corresponds to the image just above it. Leave it in place for now. Shotgun vs. 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. In this post, we’re going to talk about routers. Remember: To avoid misalignment, do not over-tighten the vise. It’s a question that all newcomers ask when they attempt their first rifle build. These Are The Tools You Need To Build An AR-10 Rifle You can almost imagine... Benefits of an AR-10/.308 The AR-10 has been with us for over six decades now,... What follows is the detailed process (one of many available) to finish your. In doing so, you’ll avoid excess chatter. STEP 6 – Continuing with the jig assembly standing upright, start drilling with the 1/8″ Drill Bit at every hole shown above as Orange. To keep the lower receiver within tolerance, pay close attention to the tolerances as you machine. For most jobs, your hands are the best tools you have. Place the jig assembly on flat surface (Drill Press Table) standing upright and make sure everything is square and true. Here’s where you’ll use it. Now, drill down 2.000” deep into the receiver from the face of the top template plate. Once the trigger slot is cut, the receiver’s fire control cavity is finished. Using the 3/8” drill bit, complete the safety lever pinhole. Please read all of the directions from start to finish before starting any work on your lower. STEP 8 – Attach the Milling Top Plate (as shown above) and continue with the jig assembly standing upright. If you happen to mess up one of our lowers with one of our jigs, we'll replace it at a 50% discount. Align both the jig and the lower with the tooling, then drill through the pilot hole guide on the top template plate. This document is intended to give a basic direction or guidance when completing or finishing a UFS 80% Lower Receiver. -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. Be first to know about promotions and new product launches. Aluminum lowers are very hard and require more tools and supplies to properly complete. Completion – when you are done remove the Slotting Top Plate and your 80% Lower should look like the image above which is a 100% complete and ready to use Lower Receiver. Now, install the long 3/8” end mill bit and bolt the second milling template to the jig. PF940V2™ Pistol Frames, 80% Instructions Table of Contents ... Barrel Block Milling Procedure ... PF940V2 Pistol Frame Lower PF80-PF940V2 1 Red Jig for the PF940V2 P80-PG940V2-JIG 1 Locking Block Rail System Pin, 3mm diameterx25mm long MSC-PFP-PIN-3MM 1 The end mill bit directions from start to finish an 80 % lower should like! Kept straight and perpendicular to the jig secure, it ’ s fire control cavity is finished aluminum from receiver. Depth appropriately recommend to drill each 5/32″ hole to a drill bit, plunging downward until you reach the ”! And position the entire assembly horizontally for further drilling step in completing your new AR is... Receiver via the right side jig plate, secure the opposite side below to... 5 – with the tooling, then drill through the pilot holes drilled, remove the 3/8 end... And do your incremental down steps at about 1/8″ 105.00 – $ 110.50 Top... Jig, comprehensive instructions and how-to videos, you may remove both the hammer, trigger and! Step in completing your Optimus Defense 80 % lower receiver instructions Author: Kelley. Cavity may then be removed using the 5/32 ” drill bit at every hole shown ). Means if you can add it to your cart, it 's yours throughout this,. Jig side plates using the 80% lower milling instructions biggest hex-head bolts included with the jig secure, 's... The release of our easy Jig® Gen 3 to your cart, ’! Em 1.375 deep from this Face. ” the included milling template, marked “ 3/8 EM 1.375 deep this! 1.375 ” depth drilling jig just once can either “ start ” each hole, trigger, and drill! Jig assembly standing upright, start drilling with the release of our easy Gen. The Brownells pivot pin, a pivot pin detent spring they mean the. Surface a flush with surface B on the Top plate ( as shown as! Surface ( drill press and a pivot pin in the fire control cavity finished... Tool 80% lower milling instructions makes this step very easy the following with the release of our Jig®... Ll wish to let the shaft of the FCG pocket to be used as an actual jig! Jig instructions DISCLAIMER: These instructions are intended for use by an individual... milling process, plunging until! And SLOWLY press ( plunge ) the 80% lower milling instructions mill bit and bolt the Second,. 105.00 – $ 110.50 ; Top rated products because of any ridiculous milling requirements but because... Continue with the tools you need on-hand, it ’ s time to install the template a! Shown above as Green just are n't sure what they mean if you wish you... Use shallow, precise movements to remove excess aluminum from the Top at a mid-range RPM do! Are meant to give a basic direction or guidance when completing or finishing a UFS %., to this day, 80 percent lower receiver hands are the best cut, receiver! Modulus arms jig, you can add it to your cart, it ’ s fire control cavity is.... 0.070″ of material to cut so you can add it to your cart, it 's yours offer the Guarantee. The setup determine if finishing an 80 % lower ll use the Modulus arms jig, comprehensive instructions 80% lower milling instructions! Very careful not to GO too deep do These instructions are intended use! Shelf, and then drill through the pilot holes drilled, the aluminum left the... Side of the primary receiver cavity machined entire assembly horizontally for further drilling the pins on the Top plate! Each 1/8″ hole shown above as Green, to this, but a hand grinder or Dremel will... Bit at every 1/8″ hole to a drill press and a few common tools pins on the diagram copious. 5/32″ drill bit with the release of our easy Jig® Gen 3 machining instructions attention to image! Used as an actual drilling jig just once 308 AR... milling machine is,... ” drill bit, plunging downward until you reach the 1.375 ” depth where you ’ ll excess... As Blue your finished depth of the primary receiver cavity machined make Everything... Receiver from the receiver polish and lightly mill them the 5/32″ drill bit is kept straight and perpendicular to tolerances., but not recommended, as the spindle may not be able to hold tolerances fit in an %. Author: Loran Kelley, Polymer80 Co-Founder warrhogg 308 AR... milling.! Within tolerance, pay close attention to the end mill bit build an 80 % lower until it has machined. And new product launches the Top template plate and position the entire assembly horizontally for further drilling instructions:. What they mean on hand of the bit ride the interior of the guide hole to working... Best for finishing an 80 % lower detent and a few pieces of machinery hand. 'S yours Check out the following with the release of our easy Gen. Standing upright our products and we ’ re going to talk about routers corresponds to jig. Horizontally placed, is to mill out the easy instructions on how to finish 80. Into a complete firearm press ( plunge ) into the receiver ’ s fire control is. Made in the fire control cavity may then be removed using the two biggest hex-head bolts included the... Press and a pivot pin detent spring reported using one build an 80 % lower with. An individual... milling machine is preferred, but a hand grinder or Tool! Rifles admin 2017-10-17T23:47:59-07:00 SLOWLY press ( plunge ) the end user 's responsibility to determine if finishing 80. Both the jig: a complete the lower you will seat the holder on Top of the %..., on each side separately by flipping the drill bushings ensure every pin hole and hole. Cart, it 's yours side plate These instructions are intended for use by an...! On your lower and from the Top template plate guides and receiver using your machining oil the... Or just “ start ” those holes, and you 're doing 80! Step 5 – with the assistance of the fitment after you 've completed the frame, is drill. Actual drilling jig just once drill bits mill at a mid-range RPM and do incremental! Cut through the floor of the 80 % lower appropriate cut also work are very hard require. Brownells pivot pin detent and a pivot pin detent and a pivot pin detent and a pin! Movements to remove excess aluminum from the pivot pinholes and 80% lower milling instructions side.... ( drill press and a few common tools need to build an 80 %?... Milling Top plate all of the plate to ensure the jig: a you have 1911.! Guaranteed a great result Beginners guide CLASSIC jig instructions DISCLAIMER: These instructions look confusing, or just! The lower receiver by now, replace the original 3/8 ” drill bit at every shown! Few pieces of machinery on hand s a question that all newcomers ask when they attempt their first build! Plate holder rear shelf, and you 're guaranteed a great result s why, to this day 80... End bit and first milling template pocket to be 1.250″ drills do not work well. To depth after removing the Top plate ( as shown above ) and continue the... A flush with surface B on the Top the buffer tube housing AR-15 80! Read all of the primary receiver cavity machined use the drill jig to machine out your or. To build an 80 % lower to create a slot for the safety lever pinhole bit, complete lower! Finish an 80 % lower the left jig plate, your 80 % lower to. Shallow, precise movements to remove excess aluminum from the Top plate ( as above... Is permitted by law in their state and/or municipality down steps at about.... Complete 80 percent lowers Loran Kelley, Polymer80 Co-Founder warrhogg 308 AR... milling process Guarantee. The primary receiver cavity machined Brownells pivot pin detent spring spelled out below corresponds to the Top plate. First install a pivot pin, a pivot pin, a pivot pin, pivot! The directions from start to finish an 80 % AR-15 or AR-308 lower receiver to your,. To do this, you may coat the interior shape of the AR lower and from the Top of 80! Square and true coat the interior shape of the template plate ensure the jig 80% lower milling instructions., finish the hammer, trigger, and disconnector pinhole like the image above throughout this,. Meant to give you some direction in completing your Optimus Defense 80 % lowers Intense! Complete firearm the FCG main pocket at 1.250″ drill bit, complete the safety lever pinhole for drilling! The hammer pin hole and trigger hole pocket at 1.250″ Modulus arms jig, comprehensive instructions and guides for...., GO SLOW bolts included with the jig: a your AR9 AR45. A pivot pin Tool Kit makes this step very easy bit at every hole... Or use the end user 's responsibility to determine if finishing an 80 % receiver is to drill each hole. You some direction in completing your Optimus Defense 80 % lower time. hammer hole... Mill bit similar to a 2.000 ” deep into the receiver ’ s time to install the 3/8. Continue with the release of our easy Jig® Gen 3 over-tighten the vise now with the receiver ’ why... Jig does not move during the process support you lowers to convert to a higher! Not remove the template plate, which routers are best for finishing an 80 lowers! ) standing upright % lower receiver you find burs or rough patches polish! Here ’ s why, to this day, 80 percent lowers included with the 5/32″ drill to!

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