What I did with my rifle was I cut down the factory spring until it was right around 400 fps. Now if you are going to do this, only cut the spring ONE coil at a time or you could screw you're whole spring up. A positive side effect to this is it makes your rifle more silent because the piston head isn't hitting the cylinder head near as hard. And as for the metal trigger, there is a fairly decent one for the L96 on hit guns, I'm not saying its the best, but its better than the factory plastic trigger and not nearly as expensive as a zero trigger.