These rings are .250" tall and fit any Stanag 1pc German made HK-91 mount, ARMS mount or any other Nato Stanag type mount. These rings are available in 30mm or 1" diameters, allowing you to purchase an additional set in a different size or a set of 1" inserts, so you can utilize your existing Stanag base.
Please be aware that we encountered some HK mounts that were made many years ago for a military contract (we believe Portugal) that are sold in the US and it seems that the receiver holes in both forks are slightly undersized. Therefore some hand fitting may be necessary (enlarging the receiver holes on the mount just a hair).
Steel construction.
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Stanag 30mm rings
Very well made product. However description did not say may need minor fitting. On my HK G3 mount I had to drill the holes out 20 thousandth for a proper fit. Not a big job however it should be noted that you may have to do minor fitting. Otherwise great product would have had 5 stars. Valdada answer: That particular mount, we believe was manufactured some years ago for a contract to Portugal. On that mount, the Stanag wholes are a hair undersized and need a very minor adjustment . Our rings are made to the correct specs, they fit perfectly on all ARMS mounts (#2, #5, #22, etc) and other European made Stanag mounts. Thank you sir.