[dpvu]

The spring being compressed would be a pretty bad thing. Just hook up your battery (make sure it's charged) and cycle it a few times. That will decompress your spring and should be done before storing your AEG.

Your hopup/BB jam issue could be related to the hopup being turned up too high or the nub not being in properly. It's a little weird to have your inner barrel filled with BBs though and the outer barrel really shouldn't have anything to do with it.