Data

 Now this is intriguing.  Real world round count endurance tests on full auto with a significant sample size.

Sounds like the fundamentals are what you rely upon.  Cleaning may be difficult.  Lubing is necessary.  Watch the bolt carrier and bolt.  Eventually, after 10s of thousands, you will need to swap the barrel (which is easier than I thought.)  Gas tubes will dissolve away.  Gimmicky ARs are trouble.  Standard USGI magazines aren't crap, but actually pretty good.  Prolly KISS working for you there.