maybe but clips wont hold that much so still had to stop and reload or even pick up a different weapon. so if someone heard 900 rounds per minute that's 15 per second for a full minute or even 450 for 30 seconds.  could be wrong but unless its belt fed something still seems off.   even if weapons had 50 round clips,  still had to move between weapons.  since neither of us was there we won't know, just somehow the math seems odd from whats being reported and we know the media is always accurate.