Originally posted by Dirklax39
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The idea is to try and get more shots per cartridge, and it can work, if you're willing to fiddle.
What you want is, generally, a medium-stiff valve spring, maybe a bit stiffer than the factory CCI. Then what you want is a good stiff main spring, but a short one. That is, when the hammer is not cocked, the main spring should not be pushing on the hammer. (Or at worst, should only have a very minimal "preload".)
The idea is the short, stiff spring gives the light hammer the energy to open the valve, but leaves the hammer free- IE, no remaining pressure from the spring- to 'rebound', or let the valve close, as fast as possible. That gives the best per-cartridge efficiency, all else (like paint/bore match, etc.) being the same.
The only real drawback is that the gun tends to be a little more sensitive to pressure variations- you get more of a swing as the cartridge empties.
Doc.
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