The 180 uses PMN - 3/8 0.043 chain. Same as the pole saws and the 170. Cuts great. Not great at boring.
If you put PM on it, it will cut slower due to the wider kerf.
3/8 LP With a sharp chain and minor mod it does great on mine.....
Stihl PMN cuts like a wild :censored: but doesn't take much to break cutters off...
Andy did Stihl come up with a better PMN chain??