OPF-G,RMR supports the entire width with the RMR and SRO, a sealer plate will not be necessary. Trijicon's position is always that In the event the person is Doubtful, utilize the sealer plate, along with the plate is so thin, whether it is used it doesn't make any big difference http://rowencustomgrips32242.onesmablog.com/A-Simple-Key-For-receiver-end-plate-Unveiled-50552780