I have a gently-used FCD steel OPF-G plate to mount RMR/SRO/etc to a MOS Glock. I also have a set of suppressor-height sights with black serrated rear and fiber optic front. For me, these sights are just tall enough to be useful without taking up too much window space on an SRO. I'd call them maybe lower 1/4.
Looking for $120 shipped for the plate and sights. Would consider trading towards a Holosun 509t and/or a MOS plate for it. https://photos.app.goo.gl/gQyc4PzFvKhtyE4h9