Probably need to take the top end off if you are planning on taking it down and have a look at the whole inside of the cylinder and piston. There are some guys who would just polish the piston out if that small amount pictured is all that is damaged. There is possibly some transfer on the inside of the cylinder wall. You could polish it and buy some new cabers if you are on a tight budget-- if that is all the damage. For me, I'd purchase a Meteor piston, get an impulse, fuel line and filter, check the condition of your air filter to see if it needs replacing as well. Then go over the whole saw, clean and inspect for any suspected problems -- give attention to your cylinder install the new piston then test and tune. I believe you will be a happy man.