I picked up MI 20 rail system NIB had no instructions in box. Seems pretty simple I cannot get the large top rail to sit flush with the rail already on the upper. I took the delta ring off and the ribs/ springs but there is another ring that is keeping it from being seated. Does this get removed it seems to be on there pretty good I want to say it is the hand guard ring snap but I am not sure. it is not attached in all spots around the barrel there are some parts of it that are raised and not touching the barrel , it also looks like there is a channel that this ring fits into, but i wonder if it is part of the barrel nut?.
HELP