Well I believe I have figured it out. I think it is an 11mm groove. CZ is the most common use for the 11mm rings. Most US made rings are 3/4" and 11mm is just under 1/2" so the standard Weaver rings are too wide at the base.
The manufacturers specs say it is effective to 400m for hunting. I am thinking it would deliver more punch than 300 BLK because it is a full size 7.62x39.
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CBOB0746
NRA Life Member
Florida CWL Since 1992
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