Well....what do I do? Two for two stuck PSA CH.
Second exact same Aero upper came. Optics Planet was great and fast for returning/refunding first.
Put in the PSA CH. Sticky, but then slide in WAY better than first upper. Thought I was okay... Pulled it out, put it back in...super sticky to stuck. CH was totally black before sticking it in (put 2000 oil on it), but came out with these totally new aluminum coating rubs from this second new Aero upper.
First two are pics of joy, last two are the problems...