These mounts are made from anodized 6061 Aluminum and built to withstand the abuse that a 12 gauge can dish out.
This mount will allow you to keep your rear sight usable in the event your optic goes down. This is similar to a "lower 1/3 cowitness" mount that you will find on an AR platform. This is a much cheaper option than anything else currently on the market!
AIMPOINT MICRO MOUNT - 1 OZ
MRO MOUNT - 0.55 OZ
*Weights are without hardware or optic.