I use one similar to this on my 110 round back w/ Accutrigger. I know they make on for the flat back, they specifically asked me about it when I ordered mine. Allows for a TON of scope adjustment too! Long tubes and short tubes fit fine. I opted for the extended base for even more adjustment. I believe they do have MOA measurement options as well, if you need that.
http://www.weaveroptics.com/rings_ba...lti-slot_base/
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