Looks like Marui has done it again...
For those of you who only have one upgraded AEG and wanted to use it for CQB, you can now spend an extra $20 and get this little marvel that attaches to the barrel of your AEG. It can reduce the power of your AEG by up to 50% without affecting accuracy. SO you can have a 400 FPS AEG and put this adapter on it to get it down to 280 FPS.
I put info on it here:
http://www.airsoftarizona.com/decel.htm