Swampfox Hostile Engagement Rings are the rock solid, easy way to mount any RMR cut reflex red dot sight as a low profile secondary optic to your main rifle scope. No adapters, no hassles, just RMR footprint mounts at a 45-degree angle on each side of every Hostile Engagement ring. Precise, matched pairs of our rings are made from 7075 aluminum and hardcoat oxidized, just like the upper and lower receivers on your AR-15. Hostile Engagement Rings make it easy and affordable to mount a 45-degree offset dot sight on your rifle.