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7/11/2008 4:33:14 AM EDT
I need a set of scope rings for my AR that has a flat top upper.  It is my understanding that I need some high rings.  Most of the rings I looked at were around $50, does anyone know of some good rings for cheaper that would do the trick?  or is this an item I shouldn't go cheap on?  
7/11/2008 5:14:53 AM EDT
[#1]
The generally recommended scope ring height is 1.4" which puts the scope centerline at the same height as the iron sights on an AR. The ring makers call those "ultra high" or something like that.  Also, ring makers define their products differently--Leupold measures their rings from the bottom of the the ring mount, to the centerline of the ring.  Burris defines theirs from the bottom of the ring mount to the bottom of the ring--you have to add in the radius of the scope to get the true centerline height.

As for cost, you could pay up to $300 for a premium one-piece QAD mount.  Leupold rings are $150 for the pair.  Steel versus aluminum affects cost. If they're for casual use, I'm sure you can do well for less than $100, but around $50....???? You might look for some used rings on the EE or other used equipment forums.
7/11/2008 7:37:08 AM EDT
[#2]
Burris makes some nice rings for around your price range.Burris
Midway carries them and so do several others.
7/11/2008 12:18:55 PM EDT
[#3]
If rings are what you want, it's hard to go wrong with the Burris XTR or Warne Maxima.  For cheaper rings, the best bet is Millett Tactical, but they're not a whole lot cheaper than XTR.  

Note that some makers, like Burris and Millett, spec their ring heights to the bottom of the ring, not the centerline, so you have to add 0.5" (1" scope) or 0.59" (30mm scope) to get the centerline height.  Most people want that around 1.4-1.5", as skipsan said.

Most inexpensive rings don't come high enough for a scope on an AR.  You can get around that by buying a 1/2" riser, but that brings the cost back up again and there are more connections to loosen or shift.

Also, rings don't move the scope far enough forward for many people, and they get better results with a one-piece mount, which can give both height and forward offset at once.  There aren't many great ones below $50, but if you've got a 30mm scope, the CAA DVSR mount is a good low-cost mount that works very well.  The supplied 1" inserts don't hold 1" scopes well, but inexpensive 1" full circle inserts fix that.

Here's the Big List of AR15 one-piece mounts:

The Big List of AR15 One-Piece Mounts

Here's a review on the DVSR, including the ring adapters:
www.maxicon.com/guns/optics/caa/caa_dvsr.htm

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