Let's build an AR15

I, too, have done only 80% lowers. That said, if my earliest attempts were successful, it should prove that the lower is not the biggest impediment to having an accurate, functional rifle. I guess the abiding question would be if the life of the rifle is impacted by the “quality” of the lower. I haven’t worn one out, yet.

The lower is subjected to very little stress compared to the upper.

Terry