i've had a kart easy fit barrel sitting around the house for a while and i decided to fit it on my old beater sistema to see how it'll come out. i've adjusted the hood length and clearance and now the next step is to adjust the lockup with the two pads in the rear lockin groove.i'm about 1mm away from the slide closing completely. do you keep filing the lug pads until it locks up right?or do i change link length which your not suppose to have to do.hate to ruin it.anybody got any experience with this barrel installations?