If you were upgrading I would start with Accuracy then FPS.
Accuracy = Hopup, barrel, nub,
FPS = Piston, Piston Head, Cylinder, spring, ect....
Tell us what type of gun you have and what are you trying to achieve?
Accuracy = Hopup, barrel, nub,
FPS = Piston, Piston Head, Cylinder, spring, ect....
Tell us what type of gun you have and what are you trying to achieve?