vehicle weapon
I notice the original question came from Pakistan, so are we talking about an in the vehicle PDW in Pakistan or in the U.S.?
In Pakistan I would want two guys in the backseat - one with an AK-47 and one with an M-79. I, in the front seat, would have an Uzi. I am not joking.
In the U.S. I would be comfortable with any of a number of reliable SA pistols - Glock, Sig, FN, etc. - or with a good DA revolver in .357 mag caliber.