Hop up off universally is the only true measurement that is equal for everyone.
However, for airsoft guns, a gun shooting 410 fps with no hop would get 100 feet of range at best, but 390 with hop could get 250 feet of range.
Which is a better situation for controlling velocity in a manner consistant with safe play?
Age verifier Northern Alberta
Democracy is two wolves and a sheep discussing what's for dinner.
Freedom is the wolves limping away while the sheep reloads.
Never confuse freedom with democracy.