My internals are holding up just fine. I left everything stock, just reshimmed the GB and added a TB. I wrapped the hop-up with some teflon tape, but didn't notice much, if any, difference.
I would have done a full blown review, but I have a HUGE aversion to "Content Link", so until Admin gets rid of it, I avoid all areas of ASR that use it, including the gallery and classifieds.
JLS isn't JG or AGM quality, but for the price, it ain't that bad.
At least the GB is easy to work on.