Originally Posted by George Burdell
What exactly is the obsession with FPS? A better hop up unit is going to improve your range more than increasing your gun's muzzle velocity.
when a gun is shooting 270fps that is a problem.
sounds like you may have an air seal problem.
how old is the gun? how many mags have you put through it?
s110 spring should give you the correct fps but i'd also check the nozzle and piston head for any damage.