Pretty sure it's a CYMA rebrand from Cybergun..... Anyways, you're not looking at 453 on .20's (maybe on .12's). It'll probably closer to ~380 stock and after it settles in I'd say probably a little under the 360 mark.
Get a chrono (or someone with one) to check it out though. If it's shooting over easiest way is to get a new spring. An M110 is what I'd recommend so you're definitely within the limits for outdoor play.
ಠ_ಠLess QQ more Pew Pew
READY TO >> RACE