Stock TM gas guns are recommended to be used with HFC134a which is pretty much the air duster cans used to clean computers. Use the search function at the top and you will find the answer to most of your questions.
About full black guns (again this has been discussed to death, there are a plethora of threads on this matter) its illegal to import, but no law about owning one. There are laws against the sale or trade but are almost not enforced as long as you are a responsible airsofter. Do not brandish the guns in public, do not play in public areas, pretty much use some common sense and you have nothing to worry about. 95% of all law enforcement officers I have talked to about this matter have said they would not act on anyone with an airsoft gun as long as its used in a responsible manner. If you use it like a dumbass they will not hesitate to shoot you, and no cop wants that on their mind. The other 5% didn't really know what airsoft is beyond the wal-mart crap.
Once you are Age Verified you will have access to the classifieds and retailers on this site that can get you full black full metal guns.
My trust is in whiskey, in weed and in Slayer, its GODDAMN ELECTRIC
Originally Posted by Pliskin
This is the equivalent to knocking on deaths door and blowing his head off with a shotgun.