I have been wanting to put a dot on my Benelli M4 H20 for a while now. I don t understand a full co witness for this. When i try to get on target quickly, my eye is pulled in 2 different directions. I think a 1/3rd cowitness is the best ( in my opinion ) because you have your iron just in case, but the dot it easy to find ( lot less distracting ). I looked at the scalarworks rmr mount but it is full co witness.
https://imgur.com/Ri9NDJ6
That is normal. A shell only exits the magazine tube when you active the release tab OR the hammer falls (the falling hammer actives the release tab, that is the design of the action)