Well, first things first:
A 26 second clip with only half animation and half ultraslowmotion title transition is not great. It's bad actually.
I prefer watching a 13 second clip, full animation, no titles at all. Just wanted to point that out to you.

Now, the animation itself.
It's ok. Nothing more really. Some critical notes are: gun is too much pushed into the right corner, camera doesn't move along with the gun. Also, the animation is a bit slow and low paced. My advice is practice with a higher frame rate and more pictures taken. The set on the other hand looks decent and it's nice to see that you're trying something new (altough this has been done before).

I don't want to be rude or anything. Just giving some feedback so you can improve.