First go to the casino by hacking the computer that opens the metal fence to the inside.The computer will then show a random color and symbol. (If it's already hacked just remember the 2 categories). While robbing the casino a third screen is in the drawer room with a number displayed.Remember this and the other two then move on upstairs where a slot machine is present behind fast circular lasers. Upon opening it a window pops up showing the 3 categories. If you input them correctly you get a paper with a code. (Police can get this item)
After getting it , you go to the oil rig (next to Area 51) and open the door to the building with the given code. Upon entering a fossil-fuel powered gun (secondary slot) will be sitting inside a glass showcase that needs to be broken (similar to jewelry store) in order to get the item. It gets swapped out for the code paper. The item has two modes.
Mode 1 in bold , Mode 2 in italic.
Name:Flamethrower
Damage per shot: 8 ; 20
Fire rate: Very fast ; slow
Magazine size: 30 ; 5
Affected by gravity.
Mode 1 causes burning effect that does 5 damage every 2 seconds for 20
seconds using fire. It can be extinguished by going in water.
Mode 2 causes a player to get knocked back using a puff of smoke.