I have 2 520 no o-ring chains that I used this season. On average we made 15 passes each time out and went out a total 6 times and swapped chains back and forth while I cleaned the dirty one.
They are Regina GPXV chains that were on a +10 raptor arm. These are $140 new.
40 shipped each
I also am selling a pingle fuel valve. They retail for about $100 new. I will take 40 shipped.