You can now get replacement piston body replacements directly from Madbull:
Madbull Direct Replacement Program
Madbull is the FIRST manufacturer to offer piston body replacementsHave you ever had a piston break in a middle of a fire fight. Don’t you hate it when that happens and don’t you hate thinking about spending another $20 for another piston. I know I do. Well, now Madbull offers piston body replacements for your broken Madbull pistons. Just switch the metal teeth on to the new piston then install into the rifle and your back into the fire fight. It gets better, you won’t have to spend another $20 for a piston anymore. These piston body replacements only cost $1.50! That’s right, ONLY $1.50! No other manufacturer has ever offered replacements for their pistons at a super low cost
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More Info: http://tinyurl.com/madbullpiston
(Madbull)