***This lower is outdated, the one found here is better in just about every way: https://defcad.com/library/aa96ea41-5d21-4f9b-b71d-f09cfa174721/***
A 3D printable AR15 lower I based off the Fosscad V5.1 GS. features reinforced front pin hole. I have printed this lower in ABS and got 2000 rounds of 5.56x45 through it. It isn't resistant to abuse, but will hold up well under normal use.