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M40A1 repo mounts and rings

From what I gathered. There are at least a two or three different profiles to that cap that has been seen. Also they’ve seen blind holes, the two hole variation which is being made as I understand it (which are all threaded so you can move the cap a little forward or back) and a 3 hole variation.
Thank you for the info Frank, I am FAR from knowledgeable on these things so I appreciate the explanation.