Skeans1
Platinum Member
Wearing out a bar in just a couple of chains is usually a sign of a lubrication problem, or occasionally a problem with how the chain was sharpened. Sometimes it's a reflection of the conditions in which you are cutting (pulling in abrasives as you cut).
Stihl bars have a good reputation for a reason. While it's possible you just got a bad one, I'd be looking for other causes.
Stihl bars aren’t known for the hardest rails in the world but more then likely with [mention]nyone [/mention] hand filing the chains were pulling to one side causing the rails to become soft.