Daan, from the link above in post #2. the seller of that particular scope has this to say about it's aiming dot and horizontal lines:
"The DOT in the center of the reticle is for ranging 9 inches (9”) game such as standing squirrels,groundhogs etc. The two parallel horizontal lines are for ranging 18” targets"
Sadly, the scope in the eBAY listing is newer than the one I have and its a 4-12x40mm AO. Mine doesn't have the "dot", no AO, and is only a 3-9x40mm
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