Some years back this occurred to me with an M3 and an Aimpoint QRP mount. It seemed tight to the touch but still seemed to move on me. I got frustrated and tried more diligently to make it move in the mount, sure enough it would twist with more pressure. Apparently the recoil was enough to shift it in the mount while hand pressure wasn't unless excessively applied.
It did not shift that much but I'd find the dot in a slightly different orientation in relation to the irons every trip and then I'd have to move it back, would shoot another string and then the darn thing was off again.
"...forgive us our trespasses as we forgive those who trespass against us..."
"I had no real need to remove it, but I like to check out things to see why they're so wonderful." - markm
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