Video was good, although at times, I have to admit I skipped until the next section. Not because it was boring, because I could just hear a gun and someone saying hit every now and then couldnt really see much of anything.
The metallic ding, whilst it didnt detract from the video, sometimes I did question whether i'd heard a BB bounce off of something like the bus or the low loader or if it was a hit as it wasn't very distinctive maybe, as Pricse says, add a kill count at the bottom as well as the ding to make it more obvious thats the "kill" sound. It was quite hard to see where the BB's were going (yes I know there was the red dot that you put on), so I would suggest some slow motion footage or perhaps some zoomed in footage for a shot thats further away.
I didnt quite understand some of the personal/in your group jokes but thats nothing major, just a thought.
Also, I would turn up your microphone when your recording audio and try to eliminate whatever background noise is going on using Audacity. Not sure what mic youre using though so it could also be the microphone.
Please take this as constructive criticism, as I know how much of a pain it is to edit Airsoft videos and get them right. Just a few simple suggestions that don't really add too much time in the editing room.