Very nice. But they aren’t the only ones out there. So now it’s about build quality and cost. Mine was purchased from CHPWS http://www.chpws.com/product/trijicon-rmr-sro-holosun-407-507-508-glock-mos-adapter-plate-v3-blow-out-sale-new-v4-will-be-released-april-2020 Sent from my iPad using Tapatalk