Ive seen it. Its like a coming of age movie. 3 teens, one not Serbian, who are friends but later become enemies. Its a little sad and a bit fucked up. In that trailer they showed part of the scene where they make one of the kids have sex with a prostitute, who is also the GF of that guy in the leathre biker jacket. The kid couldnt do it so they force him to tie a stick to his dick and do it that way. And thats the part you see, where the guy in the leather jacket hands the kid a stick and says "fucking is not science".
The ending is fucked up too. No one is really inocent.
The one cool thing was how they chamber a round into the thier Toks. They have compensators long enough that you can push them against a solid objet and it chambers a round