A dreamer writes:

If my dream were a movie, I would call it ‘The Contract’.  In my dream, we had to kill to not be killed, people we didn’t know would come, trained people, and slowly they would kill us. I refused staying anymore in that world and left, waking up in my dream world, in my house pool, with my laptop on, and I grabbed it and threw it in the pool. Though after I was worried so I took it out with me, and I woke up.

Answer:
Guns in dreams can often represent an expression of anger.  So I would ask you, is there some aspect of life where it feels like people are ‘out to get’ each other, maybe not literally with guns, but either verbally attacking, criticizing or otherwise trying to take each other down? If so that could be what this part of the dream represents.  The fact that you ‘woke up’ to another reality (while still in the dream state) might show your mental ability to get yourself out of such unhealthy situations.  Why you threw your laptop in the pool, I would have to ask you; perhaps it was another form of ‘ridding’ yourself of that unhealthy reality full of conflict.  Often in a dream when we ‘wake up’ it can represent our own awakening to a higher level of awareness or consciousness.
~Mimi