I have a K11, a four-figure serial number that tells me that it was a conversion from a 1900 model rifle. In spite of the shorter than K31 sight base, and my tired eyeballs, it's an easy 4cm shooter all day long with GP11. Sadly, now there is none in the yUK, I'm having to share the reloading with my 1954 K31, not that THAT is too much of a chore. Both were bought the same week back in 1989, at a local RAF/USAF base R&GC, the K31 costing me $79.95 and the 'rarer' K11 another ten bucks. There were 400 rounds of GP11 there if I wanted it, at $10 a hundred........
I have two SP scope mounts - one with a recently-acquired 3-9x40 Weaver [$24-95 in a gun store in Gold Beach OR] and the other with a 1.25 - 4.5x24 Hawke Endurance. I also have the latest diopter set from SP but with the addition of an infinitely variable adjustable foresight and backsight unit from Gehmann. With handloads, it's an easy MOA shooter, to the chagrin of quite a few people in our club. Both have never been refurbished, never been tweaked, and never been out of their stocks either, they are both simply gems.
tac