OPF-P365 Macro, RMRcc is designed and made for SIG Sauer P365 Macro, and P365X where the rear sight is in its own dovetail on the slide, and Trijicon's RMRcc. Machined in 4140 steel, and black oxide coated. We don't black nitride OPF-P365 Macro, RMRcc due to the thin plate extension over the slide, nitride would make it brittle. Due to the design confines of the P365X, OPF-P365 Macro, RMRcc has to be made rather tall, as it not only has to bring a flat mounting surface for the RMRcc, it also has to have adequate thickness for a rear sight dovetail.