These excellent Keeping Mojave Safe Custom Minifigures feature a custom built Desert Ranger armour and are then hand painted. It is actually a shame that they were not showcased in a photograph with some background or outside, as in a themed scene they would have looked amazing!
To create one of these helmets you need a LEGO helmet, head and round stud. Cut the pieces off from the helmet and cut the top part from the stud. Then glue the cutted round top piece to the LEGO head.
Finally the guns are also custom made so overall a great job!