We use FPS limits because that's what people can understand. Really it's power limits that you should be using.
Outdoor fields will *usually* have power limits of 1.48 Joules corresponding to 400 FPS using .20g BB's or around 360 using .25g BB's although power limits can vary depending on if it's an outdoor "FIBUA" field for example.
Also..... there are "velocity reducers" that screw onto the muzzle of your gun but they can fail and as such you could be shooting someone with a hot gun without knowing it. The best way would be a spring downgrade (what's $10 more if you're already spending so much for upgrade parts for your rifle?).
ಠ_ಠLess QQ more Pew Pew
READY TO >> RACE