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after a good while, maybe... I don't know what everyone else will say, but all the west-coasters I've met personally use propane in their TM guns, and without drastic or horrifying results.
I suppose it will shorten the lifespan of the GBB overall, but I guess the general consensus is: The performance boost is worth it.
Plus, TM parts are replaceable, metal slides will eventually come out, and upgraded valves, springs, hammers, etc... will all be available to help the gun withstand higher pressures.
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