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optic won't tighten

1087 Views 4 Replies 4 Participants Last post by  kowen1971
Well, I got my Primary Arms Micro Dot optic in today and was all excited until I put it on the rail and realized it won't tighten down enough to prevent its sliding back and forth. Primary arms said they could send me a new base they can grind down but i'd need a "caliber" to get the measurement of my rail.. hmmmm.. no clue? Any help or should I just take it to a local gunsmith to mount it?
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Sometimes called dial or digital calipers................

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