Would like suggestions for a Top Quality 80% lower. I mean a forging that is correctly made and the various drillings (holes, threads, etc) are correctly located.
5D- Tactical billet lowers have a good fit and finish. The fit actually depends on the upper you pair them with. An accu-wedge usually fixes any of the slop.
Tactical Machining lowers have worked well for me and end up with a nice tight upper-lower fitment if you don't cut the rear lug pocket any wider than it already is. I have stuck with them for that reason.