The blinding muzzle flash in Modern Warfare 4's gameplay premiere was actually a bug
Infinity Ward has confirmed that the extreme muzzle flash seen in early gameplay footage of Call of Duty: Modern Warfare 4 was a bug. The developer stated that the issue, which significantly obscured the screen during firing, will be fixed before the game's beta period. This bug marred the initial hands-on gameplay premiere for content creators.
PC Gamer
Original source
This article was reported and published by PC Gamer. feed.gg links to it as part of a story cluster — full text, images and rights remain with the publisher.