I would love a way to judge range like bowhunters have, but much smaller. Something like a single sight.
What's our typical FSR ranges we need to figure out, 30 yards to 100 yards?
Forgive the rude phone sketch, but something like this that determined range by a player's mask size
If it could be mounted to an offset rail on the gun it would be quick to get a range estimate, then twist the gun to regular sights, adjust for range and fire.
As opposed to whipping out an electronic range finder, using it with a mask lens, then putting it back safely into a pack- all before you have even adjusted your sights for the shot.