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Just change spring, spring guide and bushings..MS110 would be your best bet..should get you up to 380-400 fps..Most fields class anythin over 400 fps as sniper and you can only use semi-auto..With what you've shown that your interested in purchasing, you'd more then likely be lookin at 450 to 500 fps..I'm no gun doctor but I have dabbled so this is just my opinion
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