blaxsun
CGN Ultra frequent flyer
I am really favouring the look of longer quad rails incomparison to the short one that came with the rifle.
There has already been lots of excellent advice given, so I would only pose this question to you: is the change you seek for aesthetics or functionality? If this is the latter, I'd try it out first; you might find this is a great setup for you.
If this is mainly for appearance, you could try replacing the AFG with a slimmer AFG2 model. I've found the AFG to be a bit more effective on a longer rail, so you may find that a hand stop and some rail panels better suits you. This isn't prohibitively expensive, either. Good luck!