Love the idea and the execution here (no pun intended). IMHO there are only two minor distractions that are standing out in your shot. First the orange border, although not bad, takes away from your main subject. Second, the gun could be a bit more lit up so we could see more detail. What I do like about it is how you've captured the smoke with out over doing your highlights in the smoke and the tip of the barrel, and the grain in the photo lends it to an old detective movie or police evidence photo. Overall, I feel you've nail this challenge, have a creative shot that is interesting to look at and forces the viewer's imagination into overdrive. Well done!