Have a Jonsered 58 ga. x .325 bar with three Carlton chains that I bought new in January on 2253. Bar is 18 inch and has had about two hours total run time. Two of the chains have never been used and one has never been sharpened still cutting fine. Would like to trade for new Jonsered 18" .325 x 50 ga. bar. Just trying to standardize my chain inventory.