The only feed issue I've found is ammunition specific. I bought a whole bunch of 50 grain Remington HP ammo to use in the Steyr as it didn't run in several different AR type rifles. Either the shorter bullet or lighter gas pressure has caused quite a few failures to feed.
I'm going out later this morning to try some more ball ammo; so far I've tried a couple of brands of 55 grain ball with no problems.
Another issue I MIGHT have is with magazines. I purchased several MSAR mags (for the MSAR AUG clone), and those, combined with the Remington ammo, might be causing some problems. Using the 55 grain rounds worked quite well, but I'm going to try again today, just to be sure. At least I have a goodly supply of the proprietary AUG magazines, with more on the way from a friend who no longer has his issued selective fire AUG.