I know this is a slightly old thread but I didn't think my question warranted starting a new one.
I am getting an MR556 delivered to my FFL this Friday. I see that it has everything listed in the box minus the rear sight diopter screwdriver tool thingy. Is that supposed to come with the NIB rifle or is that something that is extra that I need to order? I called and asked the seller and he said that he did not know if it was included or not as he did not open the cardboard box with all the accessories. He left that intact. He had shipped my rifle already and it was not available to him to open the box for me.