Simunition is the "gold standard", but it's expensive and they sell the gear only to instructors they have certified.
AFAIK, paintball guns are specially designed for the game and aren't available in the form of replicas of the real thing.
Quality airsoft is probably the best bet.
"It is long been a principle of ours that one is no more armed because he has possession of a firearm than he is a musician because he owns a piano. There is no point in having a gun if you are not capable of using it skillfully." -- Jeff Cooper
Last edited by Frank Ettin; November 5, 2012 at 01:36 PM.