When I took my wildthing in for repair I had them make me a new chain. I didn't ask questions (due to my own ignorance of the subject). I just asked them to make me a new chain. Its a stihl, 3/8" low profile but I don't know the other specifics. From looking at the Stihl website I'm thinking its maybe PM or RM but heck, I don't know. I'll post some pics and maybe you can help me. I do know that i found a 4x4 post outback and it cut through it with very little effort. Any ideas on what it is? Thanks, Greg