A softer spring is usually less responsive in terms of its “pushing back” movement. A harder spring is harder to compress, but when it is released it extends much faster. High ROF is possible only when movement in BOTH directions is fast.
One way to raise ROF while maintaining the current FPS is to use a harder yet shorter spring. Roughly speaking, a harder spring that has 2/3 the length of a stock spring as well as 2/3 the amount of active coils should make it. Another way of doing this is to get a M110 or M120 spring and cut away three to four rounds of the tighter coils.
The thicker the spring wire, the stiffer the spring will be.
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