I noticed on your Photobucket pictures that there was a sticker in the mag well. It said "Do not take the seal off". Do you know what this is referring to?
I don't think you should use that mock silencer. I would recommend a Noveske KX3 Fire pig sound amplifier. It looks cooler and it actually does something.
I don't know if this has been confirmed by anybody in this thread, but I've heard the GHK AK bolts are notorious for shattering after a few hundred shots.