Nope, that just finishes an "80%" receiver, to which you then attach various finished parts. Note also that AR-15 pattern rifles don't seriously stress lower r

Nope, that just finishes an "80%" receiver, to which you then attach various finished parts. Note also that AR-15 pattern rifles don't seriously stress lower receivers in firing, people have cobbled together working ones out of plastic, scrap aluminum, etc. If you want to efficiently make one out of plain metal, you'd want at minimum a milling machine and lathe, and the knowledge of how to use them. A furnace for heat treating would also be handy, and making a good long barrel requires from what I've read more specialized machinery.