Assault Rifles, Specifically the AK-47. nearly impossible to jam, great ballistics, and is overall a great gun.
Pistol-wise I'd go with a glock only because they can shoot underwater, which is usefull in a tactical situation
Shotgun, a standard .22 gauge pump shotgun, nothing special.
LMG: I honestly doubt anyone here has fired an LMG and I'm pretty sure its pretty hard to own one and use.
Rocket launcher IRL, a stupid idea. in games, it depends solely on the situation
Machine pistol: stupidest invention I've ever heard of
SMG: MP5