You may want to check your rings/mount by twisting and moving it side to side. Larue mounts are tricky to mount the rings and can be loose when moved side to side. Also I had a out of spec upper where the width of the Picatinny rail measured .020 where spec is .035 -.005. It was so loose my Bobro would clamp down but when I applied force to it you could feel it move slightly. Solid mounts are always best but if your running BUIS then a quality QD mount that will rezero is required. I have found Bobro to be superior to Larue IMHO because there is no adjustment necessary and the one handed disconnect. For the ultimate ring to optic contact lapping the rings are also good/cheap insurance.
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