You're not gonna get a bigger battery in that gun in its current configuration. The battery it uses is listed as a mini type battery. The only way you could run a 9.6 would be to mount a battery box on the front handguard or put it in a mag pouch on the stock. Both of which you said you don't want to do. I looked into this issue for my 552 as well and seems to me there are no ways around it except the options i listed above.
Good luck.
Oh and try airsoftparts.ca for the pin, not sure if they carry it tho.
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Travis R. (aka Trapper)
Canadian Airsoft Marines. Field owner
"GET SOME"
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