That’s just twenty 30 round mags in one minute.......mags stacked for easy reach, shooting one handed from a rest like a standing over barricade position with the front hand guard resting on said barricade. Counting rounds so that # 29 was followed by a mag change to preclude bolt release slap or charging handle manipulation etc .
I think it could be close, for someone who shoots a lot, disciplined, thinking .......:o)
I am almost out of vintage 1994 surplus. Maybe two or so cases left .
I may give it a try
Whatever you do, keep your pinkies off the barrel after the first 500 rounds...