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SPR A5M XP Rail: Nonstandard?

2308 Views 12 Replies 7 Participants Last post by  BlackNoSugar, 
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Moved the scope from my AR-15 to the XP last night just to see what I would see. The scope is mounted to Burris extra high QD rings, so I expected it to be suboptimal, but I did not expect what I found. The rings lock up tight on the rail on the LMT MRP (receiver and rail all one piece) but they wiggle laterally on the XP. A lot. Adjusting the rings did not help.

These rings are too tall for the XP, and QD is not all that useful, so I'm not greatly concerned that this ring/scope combination does not work, but I am puzzled that the XP's rail does not seem to be standard.

Any thoughts? What rings are you using?
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I tried mine with a LaRue one piece mount I had laying around (LT104) and it fit fine, no issues. I have a set of Nightforce rings new in the package but have not had time to actually mount the scope I plan to use on this gun yet.
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Provided that its kosher to link to another forum, I found this to be helpful when I was deciding on rings. There is a list of manufacturers with measurements listed that made it easy.

Seekins precision rings - Page 1 - AR15.COM
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