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For the 1st problem with the full auto, the previous seller might have taped the metal trigger bar. If you split the receivers, look at the lower and there should be a metal bar that goes into the body (is connected to the trigger itself). Disconnect and see if there is tape on it, most likely there will be, and if so remove a couple layers, if there isn't, add a few layers on then.
Make sure the gearbox is aligned perfectly in the body. You also have to have the back plate that holds it into place actually pushing against the gearbox. If you don't you will get issues with the gun's performance.
If these don't work, clean your trigger contacts. That usually solves the problem.
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