if that gearbox is plastic then NO - it will bust if plastic gears
even if it has plastic gearbox with metal gears - it will soon bust
will need a proper gearbox and sorry to say may as well get a more "proper" aeg
seems to be an improved B500A1 or bulldog or M805 beginner plinker
but still not really a decent skirmish-able or easy upgrade aeg
very likely to have a M90 or 300fps spring in there and likely to be about the limit
motor might not be up to much more and deffo wouldn't advise using a battery bigger than 8,4v
(some funny videos with plastic boxes self destructing on 11.1 & 14.4v lipo's)
ok for plinking in back garden, possible get by on a cqb site but use it for what it is and perhaps
save upgrade money for a better gun - M120 will push about 390fps way over most sites btw
but if you have a plastic box like I think may be in there it will very likely bust real soon