Things I liked: I needed good rings for my Weihrauch hw75 which has a 14 mm rail. The BKL mounts fit the bill. After a few weeks of experience, I think they are almost perfect. Of course the HW75 does not have a strong recoil, if any, so the task was easy, but they did not move since I installed them and shot more than 500 pellets.
Things I would have changed: Given that I am using them on a pistol I would have preferred them lighter.
What others should know: Excellent construction, I highly recommend this mount.