[Hectic]

No damage at all on the rear teeth of the piston just some lil bits of loose cral there. The seccond from the front is actually sheered right off just like the next ones are. For the heck of it i practiced shaving teeth on the old piston so it looks like hell now at the back but im sure what happened was the metal tooth failed causing the piston to slip forward one tooth and as the sector was still tryin to complete the cycle the piston was trying to start its forward jurney thus causing the damage you see. The aoe wasnt "corrected" really it was just alrdy lined up nicely so i didnt see any need to shave the teeth.
In hind sight the day i tryed to game it it was coold and i did get a jam or two and during one i got 3x3round bursts try to go off on their own so that likely is what killed that first tooth.
Hopefully ill have it running for sunday but ill bring that old piston so you can see what i mean about the metal tooth.

As for spring its the stock echo1 spring (useually they run the stock piston for quite a while)
Just my bad luck on this gun after i get this one running ima stick to external adons and gbb's me and gesrboxes seem to not get along sometimes lol.