Chainsaw Repair

Hello not sure if this is the right forum but couldnt find a better option to post in so its here.. Anyway i was curious are these to far gone or if it would get the job done without causing further damage. The piston has only the one bad spot here but its a good piece missing.. The cylinder on the exhaust side has some spots just above and below the exhaust port. I tried to get the best lighted and focused pics i could. To me id assume they are to far gone but ive no real experience when its still ok or shot. I just recently got my compression tester and it had a seized up ring so i couldnt test any compression before i tore it apart and the seized ring snapped coming out so im stuck wondering order a whole kit..or jsut rings.. maybe piston and rings? any advice would be appreciated thanks a bunch. And any scratches in the photos are surface scratches they are very smooth to the touch beside the big one on the piston and the pieces on the cylinder.

Yes its the 441... The gouges on the exhaust port are fairly deep.. you defiantly get a nail caught on them probably beyond resurfacing. And for the cause im not positive yet. What research i could find and which matched this saw could have been either over heated from gunk build up.. possibly to many cold starts straight to work? Still trying to diagnose that problem not sure where to go next?