Problem 6: I am using 0.3g or heavier BB's and they are not going very far in my stock AEG
This is normal for a stock gun. You should stick to using 0.2 or 0.25g BBs on a stock AEG. Only move up to 0.3g or heavier on a modified AEG. If you use BBs that are simply too heavy, they will not go very far.
Problem 7: The trigger locked up on Semi
Even though Tokyo Marui manuals will let you know this is normal sometimes and how to clear the lock-up, some people want a bit more information about this phenomena.
The sector gear of the AEG (which pulls back and releases the piston) makes one rotation for each shot. When the AEG is set on semiautomatic, the sector gear actuates the cut-off lever, which in turn disengages the electric switch. Sometimes the sector gear stops in a sweet spot (in the negative sense of the word), and the cut-off lever is actuated only half way. This prevents the electric switch from being pushed, resulting in a simple click when the trigger is pulled.
When you turn the selector to full automatic, the cut-off lever is moved all the way up. You can now pull the trigger to fire the AEG, and most likely the sector gear will stop in a different position this time.
If this happens on a P90, you will need to remove the gearbox by removing two screws and a plastic plate in the battery compartment, and change the cut-off lever position manually on the left side of the gearbox. Pulling the trigger with excessive force may damage the trigger mechanism!
Problem 8: The hop-up doesn't seem to be working and my BB's don't seem to be going very far
(i)If you've had your AEG in storage for a long time, the hop-up rubber parts may have dried up quite a bit and have lost their rubbery characteristics. Squirt some silicone into the BB feed tube (inside the magazine well) and clean the barrel. This will help the hop-up resume it's normal function. The hop up may be unstable for a few hundred rounds, but it will regain consistent action soon.
(ii)You may have the hop-up setting too high. Set the hop-up to zero and adjust it gradually between shots.
Problem 9: My AEG generates a funky electric smell
It's completely normal for the AEG motor to generate some smell when a new AEG is operated.
Problem 10: BBs fall out of the gun when I remove the magazine
BBs go from the magazine into the barrel via a feed tube. The follower of the magazine does not push the BBs all the way up, so the contents of the feed tube may fall out when you remove the magazine, even though the AEG was dry-firing. Certain AEGs (PSG-1 and Type 89) feature magazines which feed all BBs, but for other AEGs it's nothing to be worried about.
Problem 11: The BBs are constantly curving to the left
You are most likely right handed (or at least shooting from the right shoulder), and the AEG is slightly tilted to the left. Tilting the AEG to the left or right will cause BBs to curve because of the hop-up.
Problem 12: The inner barrel of my TM M1A1 Thompson is not centered.
All the outer barrels are like this, so yours is not defective. The inner barrel is secured to point in the low-right direction. We don't know why they are like this, but it does not affect the performance of the AEG. In fact, the M1A1 is regarded as one of the most accurate TM AEGs out of the box!