-> go into editor, place blufor nato rifleman (has ACO by default)
-> preview
-> go into graphic settings and choose 300% or 400 % render resolution
-> zoom in (hold right mouse botton) when not looking therw the scope
-> aim for a texture where you can see the glitch (not th sky)
-> light blue shiny sillouette of the ACO reddot should appear somewhere around the crosshair