Cross Armory Adapter Plate Black Oxide Aluminum Compatible w/ RMR Optics. Attach the adapter plate on the existing RMSC optic cut as a regular optic plate. Screws are provided for mounting the plate with pre-applied loctite. This adapter plate allow user to attach RMR optics like the Trijicon. Holosun and any RMR footprint optic to an RMSC cut slide. Custom Made For RMSC Cut Slide Without Thread Post. Precision CNC Machined from Aerospace grade Aluminum with Black Ox finish that will never rust. Ultra Low Profile and Lightweight. Compatible with Trijicon RMR/SRO Holosun407c/507c/508t/509t/EPS and ANY RMR footprint optic Specifications for Cross Armory CRRMADAPTER Adapter Plate Black Oxide Aluminum Compatible W/ RMR O: Manufacturer: Cross Armory Fabric/Material: Aluminum Condition: New Cross Armory CRRMADAPTER Adapter Plate Black Oxide Aluminum Compatible W/ RMR