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I do have mine up on a riser block, I don't think that's strictly needed on a 457 since the bolt throw is less than a 455, but because of the front sight block it's needed to zero out the rear sight to the mid range of it's adjustment.
we have a number of worn out CIL 190's that we will be replacing.
The CZ platform is our first consideration if we can install the peep sights as a set.
