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Aug 28, 2017 - 80 percent lower AR-15-Drill Jig Instructions. STEP 1 – First align either Side Plate to your 80% Lower and insert two Long 1/4? Bolts through to fasten all three 80 Percent Arms is your one stop shop for high-quality 80% receivers and lower jigs. Shop through our wide range of components for your build today! Apr 16, 2018 - These instructions are meant to give you some direction in completing your Optimus Defense 80%. Lower Receiver. To complete the lower you will be drilling80PercentArms.com/pages/manuals or by contacting 80 Percent Arms. Using this product on an 80% lower will convert the 80% lower into a firearm. Even. The black colored text is instructional in nature while blue colored text provides hints and suggestions. Page 2. Copyright 2013 -? 80 Percent Arms Inc. directions from start to finish before starting any work on your lower. Keep in mind that once you start drilling, milling, or altering your 80% lower it becomes a