Werent some guys saying there was an "eye relief" mounting issue on long actions?? Curious as to how it works out for you.
Ive own a couple of the older K4's one on a long one on a short...never an issue with me.
I was happy with a new style K4 on a long-action 700. I tried to use the K6 on a long-action 77. It seemed good at the range, but out hunting in heavy clothing it was unusable. I couldn't get my eye close enough to the scope.