I have a set of the BKL adapter mounts, and, like all the BKL products I have tried, the quality is very good. But, they have been too high for my applications. Rather, I have used the J&P delrin adapters and have been very pleased with them. They are made specifically for the Burris Signature Z ring, but I expect they will work with other Weaver/Picatinny rings. They add only .060" height. Regarding the "junk" description of the UTG adapter above, I have no experience with it, but it seems that description may be extreme. It might not be a highly precision piece, but it's purpose is simple. If the ring holds fast when clamped onto it, that would seem satisfactory to me. But as I said, no personal experience with it.
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