First Step:open developers console
Second step:type "bind k kill" to developers console
Third step:join to 2fort
Fourth step:kill yourself with killbind
Fifth step:respawn
Sixth step:ran out of ammo
seventh step:hold m2 and press h for pick up your flamethrowe



Good Luck
i found this guy if you don't understand my guide wacth this tutorial
https://www.youtube.com/watch?v=0-1RgFWR-x0