Hard one to answer since a lot of it depends on weather conditions sooooo
Assault Rifle muzzle flash can generally by spotted at around 150-200 meters if you are looking in the right direction, what mostly catches your eye is the effect of the muzzle blast, bush or branch shaking against the wind, dirt kicked up, etc. IMO, it rather looks like a small penlight strobe flickering.
Machineguns have a much more noticeable signature, of course.
If someone is fearing from concealment, unless you are looking right at them, you will most likely never see the flash. The report of the round would tend to give you a direction to look in and such things as the interval between the bullet strike and the report can give you a very rough idea of the distance.
Hope this helps
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