OK...... Here's what I found. I pulled the gearbox this morning and found several teeth were chewed on the motor pinion gear, so it(the gun) was going to fail soon anyways... I checked the nozzle and the tappet plate( that is the piece that the air nozzle slips it's groove into isn't it?) and found nothing, no cracks or chips or breaks.....?! The piston seems to have a little extra slop between the o-ring and the cylinder wall, the piston looks great, no chewed teeth I'm using a Systema Area1000 piston head, the o-ring was fine, no cracks or brittleness... I don't know WTF is up with it....! I have at least 15 to 20 thousand rounds thru it with my gearbox in it's present form, I'm going to back down from a 140 spring to a 120 and replace the o-ring and probably the nozzle just because I have it apart. I'll keep the Torque-up gears that I have in it and replace the pinion gear on the Systema Hi-Torque motor and we'll see what happens??? I'm wondering if the pinion gear might have a little something to do with it but I don't really see a correlation between the two...