buy a fully grown male african lion, and spray your marker and equipment with feline estrogen...
no seriously most paintballers that i have met are honest *******s that would rather give you paint than steal it. if youre really worried, get a hard gun case with two locks on it, and lock it and your marker to a pole... that is like 99% foolproof unless theres a local paintballer who makes a habit of toting along a hacksaw...
or just do the lion thing
