i've never had any problem with mine at all, put a LOT of rounds through mine.
if they look good, don't worry about them, it's the black plastic ones that were the problem, the alloy ones, generally worked well.
if you do replace them with green ones, be aware that you will have to make some mods to the follower to allow the full 20 rds to be loaded (shortening the follower legs)
personally, try em, if it ain't broke, don't fix it!!!!