are you sure your gears were set properly when you re-installed everything...
If the gun sounds like its trying to fire when you pull the trigger, its not a silicone oil problem nor a fire select issue.
Sounds to me like the problem is internal. Id strip it again and verify your installation. I had a problem much like this where the piston was not pulling back completely. The tappet plate was being pulled back by a mis-aligned gear causing it to feed bb's. Full auto worked, much like yours does.
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