Stihl RS on everything but my 136 Husqvarna and 272xp . The 136 still wears its 22 year old original chain and the 272 has a 24" Husqvarna skip and a pair of 3/8 .050 Husqvarna chains for 20" that I bought with it new in 1998 . They are the toughest chains I ever owned , slow to dull and seldom...