Harley T the picture in the Stihl catalog you posted seems to indicate they figured out how to make low kick back without bumper drive links. The pictures of the chain packages clearly has bumper drive links. Pictures form my paper catalog and file from post #16.
I have some quarter inch pitch Stihl chain with non current number, Was able to resist posting what is the difference 13RM.
from the descriptions
All the performance of
vs
many of the performance features