I never really put a terrible amount of value in a "burn-down" video test. Even in most military situations they aren't continually firing mag or belt dumps in full auto. Even heavier support machine guns are not used in this way. Its in bursts for a reason.
In any case, surprised the Pioneer gun held up that well and as far as the mags, mine work on semi and no plans to use on full auto so I'm okay for the price. I'd be curious if the AC unity cheap 5.56 mags do well on full auto as well.
I need to get some OD mags.
My Military Bulgarian mags (Vintage) are very relaible - again only used on semi.