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    FX PCP Airgun Tuning - Why would the FPS go down when increasing the Hammer Spring at a constant reg pressure.

    Hi All I have a very early FX Crown (in the first 500 made) It has the 8mm reg piston - I only mention that to date it. Now I have been out of shooting it for a while and it used to be an good gun and Shot JSB King Heavy MKII’s best at about 800fps and 120bar reg, this was how it came from the...