I am using the Sureloc Supreme scope with a 0.6 diopter grind (5x approx). The lens quality is excellent and the adjustment mechanism is solid. So far, I have not needed a clarifyer for the scope - just played with the peep size (superball kit) until I got a good sight picture and centering feel.
Carter Releases .... Shoot The Best!
Sureloc Supreme Sight
Sureloc Scope w/0.5 and 0.6 diopters
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Glory Be To The Lord