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2/3/2007 2:30:05 AM EDT
I have a DD lite rail and a flatop upper. I have a leupold scope that was mounted on a bolt action rifle to a picatinny rail. Is there any reason I cant mount it on my ar with one ring on the handguards and one ring on the flatop? Do I have to get something like a larue scope mount?
2/5/2007 6:59:11 AM EDT
[#1]
There's a good chance that you'll damage the scope mounting it that way.  You'd be better off with an extended riser (often called a scout rail) on the flat-top.  It is necessary to mount the scope forward to get a comfortable head 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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