Flashlight holder on the RIS bar (D20,D22,D24,D25,D26,D28) airsoft, pistol, rifle

For best result PETG or better, 6 layers top and bottom, 6 walls, infill 35%+ cubic. No support needed. orientation as in the photo

with these parameters, it will withstand a direct hit from a ball, 1.7 J. I haven't tested higher.
You will also need a countersunk head bolt M4x30 (I use M4x36 to seat the nut) and an M4 nut.

If you need different diameter just write a comment.