Did you use the steel or the aluminum version? I love my K31, but my eyes aren't getting any younger. 100 yards is okay, but 300+ is getting to be a struggle with irons.
DD,
I used the aluminum one - cheaper than the steel. Is a very well made mount and I think no chance of moving the way it clamps on with only one screw. I put it on the rifle before ever taking it to the range the very first time I shot it as I did not believe I could shoot iron sights accurately.
Please note that your scope will sit to the right of the bore and will be pretty high. Only problem with this is canting the rifle can really screw you up big time with a high scope mounted to the side. I also put a bubble level on my scope to make sure I did not cant, but you can use vertical crosshairs to line up the same way with an individual target. The scoped K31 was very accurate but a pain to try to not cant, and to work the mechanism to load the next cartridge without destroying all the setup in the rests from the previous shot.
Being very accurate to the point of boring, yet a big pain to shoot is what prompted me to take the scope back off and start again with the iron sights.
Good luck with yours! Enjoy!
Les