I'll work on the Fire Pistol although i've never encountered that bug.I have encountered a serious problem. (Fire Pistol) If i hold down fire for more than a few seconds I start to lag to all hell.
It might be because the gun seems locked in the mid-firing position, where the chamber(?) snaps back to load another bullet, except its stuck at the farthest back position.
Police use the Kobra, and you can guess the amount of lag that I experience when I get into police fights.
Also, the molotov firing doesn't seem to work. I still do the animation of throwing the molotov, and throw it out of my hand.
The lag can't be fixed as it's due to your PCs' spec- I have a Intel core 2 duo 2.56 GHz + 4GB of ddr 1333 RAM + 9500GT(1GB) and I still experience a bit of lag.
the molotov-Use the gang assault rifle and fire one out of the attachment it should explode like the molotov.
MAKE SURE TO SELECT THE GRENADE WHILE DOING THIS!
*There is an update in the OP*