A blank cover plate, plus two adaptor plates meant for Glock slides with RMR footprint optic cuts. The edges are radiused similar to an OEM slide.
There is an adaptor with a Picatinny rail mount, ACRO type dovetail rail, and one made for the Geissele W&S red dot's unique rail footprint (not quite ACRO).
LBRY Tags: rmr; guncad; glock; 3d2a; acro