I like to run in the tunnels with a PaP'd M16

Made it to 43 before I got bored and quit. Maxed bank in 1 game.
But you can also run at the diner, use the MP5 Pap'd (not as powerful, but still works)
You can run at the farm. Have PaP'd gun in fridge, get 2 other good guns.
If both guns run out of ammo that you're holding, go get yours from the fridge.
If Max Ammo shows up, put
the gun with the MOST ammo in the fridge and max the other 2.
Those are some of my favorites.
the m16 strategy is the only other one i have tried, i dislike the diner as going to get ammo sucks as opposed to the 74u where u literally walk 2 feet and u have max ammo, thanks for the input though, also is there a way to effectively use the jet gun?