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[–] x5060 0 points 2 points (+2|-0) ago  (edited ago)

If you are looking to build an Ar-15 lower from parts I highly recommend the AR15.com guide. I used it about 13 years ago to build my first firearm.

https://www.ar15.com/guides/files/tutorials/assembly/lower/index.html?gid=183

As for 80% lower machining I would recommend some youtube videos but I have no idea which ones are still left. =(