>>64461877
All those 3D printed and Polymer ARs with 3D printed fucking barrels, BCGs, and gas systems?

Sounds like I hit a nerve, Chinglish. Why don't you go back to huffing paint thinner, and pretending you know jack or shit about Engineering when all you do is pretend to work on a construction site, while silently seething your dreams of becoming the next JMB were filtered by Calculus I derivatives.