Yeah I am very surprised, I have not had any malfunctions at all. I didnt use any tools or jigs. This was not an 80% lower but a completed lower. I already had nice hand files and lapping compound to fit the required pieces. Having the jigs for cutting the lugs on the barrel, frame rails, and FCG would have been nice but you can do it all without it. Lots of time and marking fluid with very small changes.
I took my time on this and spend an hour here and there over a year doing it.