FPS multiplayer-networking problem

Hi! I'm trying to create a FPS multiplayer game, but when i build the game to test the multiplayer feature i noticed that when i shot the test block on one of the games it wouldn't get destroyed on the other game. I later noticed that when you looked at the other player, even if the player would look down, it wouldn't show up on the other players screen. Meaning that when one of the players shot a target it would disappear on his/her screen, but the other game would disagree and say that he/she missed.

It's a bit hard to explain so i will include a link so that you can download the game and try it for your self if you would like. Sorry if the project is kind of messy, but i'm fairly new to this.

Thanks to any and all responses :)