I first ran across the bolt together AR-15 lower receiver plans years ago. Now fosscad user Rollatroll has taken the PDF files and modeled them in CAD.
“The Gauntlet has been thrown down and the 3dprinting faculty has answered with this lower receiver you don’t need to 3dprint but you TOTALLY CAN.” -MaDuece
The file is not yet up in the megapack but we hope to see it in 4.8. If you just can’t wait head over to the chat room and if you ask nicely you might get a sendspace link to the file 😉 but before you go off thinking you can 3d print this know that some modifications will be needed to reinforce some of the weaker areas. On the other hand now that you have the CAD why not CNC yourself a set?