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  1. T

    Tuning Power issue with my FX Impact mk2

    Hi, I have have a highly modified FX Impact mk2. Slug kit, Dual TP, stronger hammer weight and spring, 72cc powerplenum. It has the 700mm barrel on it. So I am trying to get 40 grain slugs to go at 1000fps but even on 170 bar reg pressure the max is 920fps. Got the weaker valve spring without...
  2. T

    Tuning Power issue with my FX Impact mk2

    Hi, I have have a highly modified FX Impact mk2. Slug kit, Dual TP, stronger hammer weight and spring, 72cc powerplenum. It has the 700mm barrel on it. So I am trying to get 40 grain slugs to go at 1000fps but even on 170 bar reg pressure the max is 920fps. Got the weaker valve spring without...