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Posted: 10/30/2006 8:20:53 AM EDT
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do i need high rings to clear a 50mm objective lense on an ar flat top thanks |
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To get the scope high enough to see through you'll need extra-high rings, and there will be plenty of clearance for even a 56 mm scope. Be sure to consider eye relief as well as height - the Picatinny rail on a flat-top may not let you mount the scope far enough forward for a comfortable position, especially in prone. I use an extended riser (1/2" high) made by Accuracy Speaks (available direct or from Brownell's) combined with standard-height rings. There are now a similar ones available from Compass Lake and White Oak, among others. This gives me an extra 4" of rail to let me mount a Leupold 6.5-20x50 LRT (a rather long scope), and gives me the option for an extra 15' of built-in elevation for long range work. For ranges up to 600 yards, a simple rail extender like YHM's <http://www.yhm.net/store/rails.html> should do the job for less money. I'm using Burris Signature Zee rings - they are inexpensive and work well, even though they don't have the macho look many seem to like. They use a floating plastic bushing to minimize stress on the scope tube and simplify installation, and offset bushings are available. Bushings with a 0.010" offset are included with 30 mm rings, and 0.010", 0.020" and 0.030" bushings can be purchased for 1" rings. They're inexpensive and work very well. I use them on my spacegun to mount a VX-III 6.5-20x50 LRT and have never had a problem with them. Removing and replacing the scope has never shifted the POI. |
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A 50mm objective has a ~1" radius. So to answer your question, any ring that raises the scope axis to at least 1". The most common heights will be 1.4" and 1.5". Unfortunately, most ring manufacturers do not list height to axis. Instead, they list height to bottom of scope, which involves more a little more math. Even worse is describing a ring using vague descriptors such as "medium" or "high". This tells you nothing about using the ring for your specific application. Brownells is a good website to shop because they went through the trouble of measuring rings. Click the "specs" link on the rings. Want to see a slick website? Check tacticalprecision.com. They show all the specs of thier rings. Height, weight, threads...all there. As previously mentioned, keep eye relief in mind. If the scope position doesn't allow the front ring to mount to the reciever, you'll need a cantilever. |
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