Best Water Gun Ever

my dad taught me how to make this amazing water gun today so i thought i would put it on instructables for this project you will need

an old fire extinguisher (pre 1990's)
an air compressor that can go up to 120 psi
water 

we went to a garage sale today and bought a perfect fire extinguisher for a $ 1.50 but im sure most people wont be that lucky so i would look at garage sales and on craigslist and other places for one it should be a large fire ext. i think mine is like a 2 gallon .

remove nozzle apparatus and fill about half way to 2/3's full and put apparatus back on ( make sure it is on correctly and very tight ) 

after you tighten everythig up your ready to compress it . on most of the fire extinguishers at least the older ones have a bicycle valve so you can compress it . when you are compressing it listen for leaks and any wierd sounds except for a bubbling sound in the container that is fine .
compress to 100 psi ( most fire extinguishers have a meter )

pull the safety pin if there is one and it should shoot 25-30 feet in a strong beam of water.