Hi, I recently purchased  a Gen 4 STG 556. I've read through the threads and have some questions:

Which brand of magazine functions 100% of the time?

Who will do off warranty repair work?

Does the Aug nato stock work with this unit? I've seen some threads where the parts fit but nobody pulled the trigger and gave it
full range evaluation.

Where can I buy AUG magazines and parts?

Thanks,
Rob

Congrats!
All of my MSAR STG mags have functioned 100%.
Ratworx is doing repair work.
I asked about the Steyr NATO stock and was told that the recoil spring rods would probably have to be shortened and dome fitting would be likely. I believe DR was running one on a MSAR 7.62x39 prototype.
PJ's have just about everything AUG. Ratworx is the place to go for MSAR stuff.

HTH...