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you shoud be just fine with an ordinary TM piston.
remove the second tooth on the piston to make sure it is grabbed properly by the sector gear. you mig also have to shim the piston a little bit back, to make the engagement perfect. just put som kind og metal washer between the piston and piston head, and use a longer screw.
running a low ROF under 23 per second should give you well over 40000 rounds before the piston breaks.
keep the barrel clean, most of the times a piston break because a BB gets partially stuck.
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