Each time you kill an ally, you will be deducted 100 xp. I suggest not doing this because A. You can actually be demoted a level. (It happened to a friend of mine) and B. Someone will be sure to cuss you out before the match ends.
You put the health on double. in private match optional: put on friendly fire ANd right before / when he shoots you with a shotgun jump and youll shotgun jump!
u cant.
rapid fire you can buy of eBay
It means when you fire without aiming.
Get to middle of screen and luck fire
Well he will ignore it the first couple of times but then he will shoot back after a while. He will also shoot you if you wait too far behind.
Walk around with a sniper a just shoot. (Hip fire)
ump45 is better by far and when it has silencer it rules
Depends on what kind of game you like more. Personally I think MW2 is better. well yah for me and this other guy i guees by far
in multiplayer some guns will have rapid fire attachments than can be unlocked. it greatly increases the fire rate
well yo hack your way back
yes! Its back just like it was in MW2.