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Here is my "possible" solution to you problem....
It would need a few modifications to you system... but it should be nice in the end...
Don't try this unless you have the knowlegde to do it... or it will problably fail/break your gun.
Look around on the web to find a Brushless motor. They are around 100$ each usually...
One that possibly will work (not tested yet!) is the CastleCreations Mamba 25 motor. I recommend that you stick to 5000'ish Kv (it is the speed of the motor).
Then use ULTRA HIGH TORQUE gears, and shim them to the perfection. If not your gears/piston/bearings will wear or break.
Also use a 7mm mechbox with ball bearings.
The hard part it to modify the trigger assembly to have the Speed controller for that motor to work. You will have to find a servo simulation circuit and some place to have the esc/servo simulator. Then wire the servo simulator using a Boolean switch (logical switch) to bypass the potentiometer of the servo simulator. Then wire the whole thing and you get a 65000 rpm motor with insane torque. This should be helping with your gear dying all the time. Also... these motors only use about 1/3 of the energy of normal motor and have no maintenance whatever.
Try using stock spring, then upgrade your spring lightly if it works.
*edit* oh and you will have to find a way to fit your motor gear on there... but should not be that hard....
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