Infantry and braced autoguns have a special muzzle flash that shows when you crit. This is far too large/bright and blinds the player when shooting.
A normal muzzle flash looks like this:
A crit muzzle flash looks like this:
All you have to do to fix this is change the size increase to about a 50% increase in size instead of the current ridiculous 500%.
It is less of an issue on braced autoguns because you cannot ADS with them. But it is particularly blinding on the columnus infantry autogun because the barrel is short and it crits in volleys, meaning that whenever you crit you get four crit shots in a row and thus four crit muzzle flashes in a row. The Deadshot talent in particular makes this problem worse because it boosts your crit rate while you ADS.