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What I read in the e-mail sent to Apoc regarding a CA notice was to not turn the hop up on too far as it'll cause that problem.
Overall, the mech box is easy to remove (WAY too easy!!!!) and there are 8-9 screws to take out. Swapping the piston should take no more than 20mins from start to finish. Best to just put in a stock piston and have fun. Apoc's has been through over 5000rds so far and it's still banging along.
Oh, I should say that we tried to install an aluminun piston we had lying around as a spare, and it wouldn't work at all. Noticed the groove in the piston wasn't as wide as the rail on the mechbox sides and it was jamming up huge. We filed the piston groove wider and it worked, but not very well with that piston. From that point we put in the stock piston and perfection was achieved. Nutshell, avoid aluminum pistons in this gun.
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