I just noticed this last night and it's kinda weird. if you created a firefight gametype with bottomless clip (probably works like this in custom games too) and you grab a plasma repeater and just hold the trigger, the reticule will continue to expand until its off the screen. then after a little while another reticule will appear in the center of the screen and do the same thing, but slightly faster. in fact, this process continues for quite some time until the reticule grows faster than you can see it and you'll not see a reticule at all. keep holding the trigger and the reticule will reappear without expanding and will just sit there. when you release the trigger, you can watch the entire expanding and recreating process unwind. I think the reason that for a while it vanishes and then doesnt expand is just because of framerate issues, although i don't really know why it does this in the first place as opposed to just having a maximum reticule size like the needle rifle. the reticule size does not effect the spread beyond the max spread, so its purely a visual glitch. will post a video asap, unless someone else will.