I got this gu about 4 months ago. When I first got it I charged the battery and spent about 30 minutes trying to get the battery in the stock. Well I got a bipod,metal magazine,new battery,new stock,flash hider,new sling,BB's, and I ended up havind my Dad rewire the stock wire assembly with silicon wire. I would say that I spent about another $200 upgrading this gun externally which was pretty bad. If you want a bigger battery then you must get a different stock period.
400-410 f.p.s. average
bad stock wire assembly
cheap battery,stock not large enough
plastic magazines,one broke in about 2 months
a bit heavy
Overall ,unless you want to upgrade save your money for a better manufaturer
Rating: [4 of 5 Stars!]