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Looks like a parts failure...plain and simple. It is entirely possible to stress the part by over tightening the piston head screw. Blue loctite and firmly snug is all that's needed.
Check the shimming...even though the set is "pre-shimmed" doesn't mean it can't be adjusted. Personally...I've never cared for the caged gear sets...I tried a set and they were noisy as crap. You can get bushings and just take the gears out and shim them yourself.
Motor height can be adjusted without the cylinder/spring/piston/etc... in it...just the gears and trigger/switch mech. Do up the mechbox and mount the grip/motor/motor cap. Set the height (quietest sound). This is just about as good as it'll ever get. You can run in your gears at the same time....hold for 30sec bursts...until you're thoroughly bored.
When you put the compression parts back in and test fire...if it's screechy under tension then you're left with A) live with it...B) reshim/try other gears/motor/etc...
To check piston fit put just the piston+head, cylinder head and cylinder (no gears or other stuff) into the mechbox and do it up tight. Use a rod to push the piston all the way back (put the rod into the nozzle). The piston should go back nice and smooth. You should be able to push it back forward (stick the rod into the hole where the spring guide would go)...again it should be resistance free. If it's binding...alter what needs to be altered to free it up.
So far as the battery/laggy-ness of your setup...it sounds like those little batteries aren't getting enough power to the motor to crank the MS120+ spring.
- that motor should be more than capable (don't keep trying until things get hot...it's not good for the magnets)
- the gear ratio should be ok
- wiring (of mechbox or batteries...or inbetween mechbox and battery) is iffy. You've got the switch+block, mechbox wiring harness, motor connectors, any connectors from the mechbox, any extensions (through stocks, etc...), the connectors there, the battery connectors and battery wire and any connections on the battery pack itself to look at.
I run a bigger battery...the mini pack 1200mah is too small...the 1600 mini is marginal. With small cells like that in a m120 gun it'll be stressed to work for very long...and if the batteries have seen some use they might not work at all.
So if it were my gun I'd just run new wiring and minimize any connections right to the lead that the battery will connect to.
Not a fan of aluminum piston heads. Sorbo pads...whatever floats your boat...make sure your angle of engagement looks good.
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