nice effect on the ppc, but your tracers and muzzle flashes need some love
some reference
http://video.google.com/videoplay?docid=-2676268927161385975&ei=ild9Sb2RK5PiqQLO77HUCA&q=minigun+tracers&hl=en(edit) here's a version done in photoshop, don't mean to rain on your parade, but tracers and muzzle flashes are what i became infamous for back in art school.
Grinder sparks and splatters make great brushes in photoshop for muzzle flashes. Also, color dodge and overlay can really get the brightness up. I normally draw a flat color muzzle flash, duplicate the layer and have the new one be color dodge, duplicate that one and go into hue and saturation and take the hue slider all the way to one side. In most cases this will blow out your color to give a white hot center to the flash. If you find that the original color is too far lost, make a duplicate of the original normal layer, and blur it, this will make some of the original color blend out from behind the flash. Any adjustments can be made in a new layer of your choice, but i prefer to tweak parts of the flash in an overlay layer to darken up the edges slightly, or introduce more color.
For tracers. Even easier. Make a simple line to some tracer appropriate color, size it, rotate it and put it in place. Set the layer type to color dodge or one of the other transparent brightening type layers. Then use motion blur on it. Remember, the trick to getting tracers to look good in a stationary image is to show speed. Don't try to overdo it putting too many tracers too close together, it will make them look slow. Long thin streaks. Also take an eraser on a low opacity rating to slightly erase the tail end of the tracers slightly, so that they are brighter on the leading end.
the ppc was done using effictively the same technique as the muzzle flash, however i made judicious use of the smudge tool on the original layer to get some of that coruscating effect on the beam and making the muzzle flash look a little more electric. i then went in with a color dodge layer and a thin brush to add the tiny arcs of lightning around the beam
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