If you haven't read Madmaxx's thread on Inner Barrel length matching with Cylinder Type, basically
1) When you barrel is matched to the type of cylinder you have, you'll always get good accuracy because the output volume of air (from the cylinder) will always be allowed to fully develop and stabilise within the inner barrel before it leves.
2) after a certain critical length, no matter how long your inner barrel is you will not increase the accuracy any more (though FPS will increase)
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