Sorry to hear of your woes... I also tinkered with mine. I choose the ... I am going to fix it route, rather then sending mine in... but I like to tinker. The buffer tube sounds like an easy fix. Mine bound up as well for a few rounds, when brand new... after the bolt lugs wore in.. 10ish rds .. it works perfect. What did you do to fix the extractor ? I am curious if you had some of the double O rings Grinding the bottom tab shorter on some of the PSA Bolt releases solves that problem. And frankly... every .308 AR I have fired has been overgassed... I'm not sure what makes them all drill such large gas ports... I mean the .308 puts out "about" twice the volume of gas then a AR15... the garden hose v. fire hose thing... same pressure , just a lot more volume.