I have a 2012 22" and the main things that stand out:
- the charging handle had an edge so sharp I still have a scar 8 months later
- the op rod guide mounted slightly off center
- barrel slightly over indexed making the iron sights look off, I however also inherited an M1A Springfield and it suffers from the same problem
However I've put a lot of rounds through it and with a scope mounted it's a great rifle. I thought about having the kinks worked out of it but I can't justify spending a bunch of cash on a 400$ rifle.
I had those two issues too. Had to file the edges on the charging handle and Hungry helped me out with the over indexed barrel. No regrets with my rifle though!