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You can get a simple (homemade) IRLB3034 based MOSFET. That take the resistance of the trigger contact out of the question. That is also never hurt to have whether the problem is the trigger contact or not, expecally for a gun with hard-to-buy (read: not V2 or V3) trigger contacts.
After that you can see whether it is a weak-old motor or friction on the gears.
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