To be at the iron sight height, you want your centerline to be about 1.4" above the flat top. Many people like this height, as they can use the same cheek weld and shoulder position for irons or optics, making aquisition and sighting faster.
If your CASV is 0.5" high, you want about 0.9" high rings.
Ring heights are different from vendor to vendor, and even within a vendor's different lines. Burris' highs are a different height than Leupold's QRW high, which are different from Leupold's Mk4 high. You'll want to check the specs for whatever rings you're interested in to make sure they're right.
Also, some rings, like Burris XTR, are spec'ed for the height from rail to the bottom of the ring, while others, like Leupold QRW, are spec'ed from the rail to the centerline. If they're spec'ed to the bottom of the ring, you have to add 0.5" (1" tube) or 0.59" (30mm tube) to get the centerline height.
Warne Maxima or Leupold QRW/PRW Medium or High will get you close to iron sight height, depending on whether you want to be a little over or under.
Leupold QRW/PRW Medium - 0.88"
Leupold QRW/PRW QRW High - 1.00"
Warne Maxima Medium - .375"
Warne Maxima High - .525"
(add 0.5" or 0.59" to the Warne height for the correct centerline)
Both the Leupold QRW and Maxima QD are reasonably priced QD, and are good performers for their price point. The non-QD Maxima and PRW are a bit cheaper, and are also good values, as is the Burris XTR. Bumping up in quality from there will take you into the over $100/pair range.
Quote:
Originally Posted by FlyingPen
Well they are UK based, so I assume so?
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The company is UK based, but the scopes are Chinese. As with all Chinese optics, support entirely depends on the vendor or company, so you might want to check on experience other people have had with their support.