Streamlight Protac HL-X Remote Switch Mount. This will attach to your AR picatinny rail.

Uses two M3 x 30 screws and two M3 Nuts. Since the screws are small, use at least blue loctite to make sure it doesn't screw off.

Print in the orientation as-is, and use supports. Print with 5 perimeters, bottom and top. The infill doesn't really matter. I printed this using Prusament PC. I would recommend at min, using PETG. The heat can be brutal here so something that can resist heat is recommended.

Once printed, put the remote in first, then onto the rail, then the screws. Everything is SUPER tight, even pushing the screws through.

Someone asked me to upload gcode for PLA, so added.