forbidden sniper technique
UPDATE: https://github.com/ValveSoftware/sour...
This exploit has been fixed, the scope is no longer able to be animated and thus we can no longer reposition it offscreen with an onhit event.
Instructions in this tftv thread from 11 years ago: https://www.teamfortress.tv/22021/rem...
Valve should probably whitelist HudScope from being altered in the HudLayout.res file but they probably never will so if you're feeling extra scrubby go ahead and do this. I've already disabled it since I'm not used to having my crosshair visible when I'm scoped in so it kinda messes me up.
Overall this is advantageous to use but it's not too game breaking or anything. There are a handful of examples in this video of shots that definitely would have been harder if I had the scope.