Get a Modify 100 spring, should set you around 360-370fps, and also is a softer spring as far as compressability goes, so it'll net you a higher rate of fire without struggling in a mildly upgraded gun. Also, in a V2 mechbox (no idea what you own), higher rate of fire with a heavier spring is more correctly called "Higher rate of wear" for a lot of the internal parts as well as the mechbox shell if a V2.
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