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I'll throw in as a tip, the spring on the hopup unit can be substituted with the spring from a ballpoint pen (the cheap clicky-click kind where the writing tip retracts, like they give out at trade shows with companies' logos printed on them); just cut the spring down to the right length, and it pops on to the hopup unit.
I find it actually works better than the ones G&P supplies with the hopup that comes with their aftermarket receivers (the ones from the pens aren't as stiff and seem to spring back towards the mechbox more easily. Just don't cut it too short.)
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