I notice that in certain areas of most, if not all the maps, or maybe at certain times, my gun glows orange. I notice it happening a lot. Why? You can't tell me there are that many orange lights on the Ark, is it there to tell you you've got a killstreak or something? I don't know, I'm curios, what do you guys think? Thanks for all responses in advance.

It means an engineer has given you a weapon buff. The glowing shows you that your gun is doing more damage.

Ah, ok. Thanks.