I love a Holosun 507c-gr for a lot of reasons. It would certainly work, but I imagine most would. That Holosun has +-50moa of adjustment from center. If you're 12" off at 40 then that would put you 30" off at 100, or 30moa; 14" at 40yds would be 35" at 100 or 35moa. You just need to be absolutely certain you've got a sight that will provide +-35moa adjustment assuming the LongBeards are at center. All I'm getting at really is that you need to make sure you've got a good bit of adjustment available.
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