NO.
The back end of the spring guide is forever and always FLUSH with the back of the mechbox, it has only ONE position.
The retention pin that's supposed to go in there locks on the groove of the spring guide, NOT the back of it.
The spring guide is in too far, when your piston goes back it over-compresses the spring to the point where it becomes solid. THAT is why your piston is breaking.
It's impossible to be out of alignment because it's the BORE that aligns the spring guide, it has nothing to do with what's behind it. Case and point, the stock gun works with the 3mm lock engagement on the back, your wooden block with 100% engagement does not.
Between the 3 people who posted there's over 8 years fixing guns, you just stripped 5 pistons in a row and you still have no idea what you did wrong. Set your spring guide up properly, try it again, then come back and tell us the result.
