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Get the prommy, its not a good idea to have hard teath on the full piston one ar two metal teath is all you need. Get some good gears (and metal bushings) as well, they take more from lipos. The nozzle, cylinder head and spring guide need upgrading as well, V3 for the sig don't forget. If you want a high fps invest in the sorbo cylinder head and piston head to save the mechbox some wear. I don't know if you need to swap out the motor, if it can't pull the spring it will be a problom but with lipos the rof will go up and you should see all round motor improvements (moe wear though).
But do yourself a favor and read up as much as you can on this cuz you don't wanna waist money.
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Con Murder
Dark Rhino
L.A. Airsoft
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