DIY 80% AR-15 odd equation or gunsmitning fun? part 3: in parts 1 and 2 (3/20, 4/20 issues), Matthews showed how to make a traditional aluminum AR receiver. This time, he takes on the challenge of plastic receivers

Traditional gunmaking materials like steel and aluminum are more and more being replaced by modern polymers. Many of today's plastic wonder guns run almost flawlessly, so I guess you can't [...]