Normally, the eye of a wood round sitting in the wood pile is good enough for pootling about with a .22.
A marker pen cross on the back of a pizza box is the fancy version for me, either perched on the same wood pile or pinned vertically with fibreglass poles near the bottom of a hill in the paddock for "long range" sighting with something louder and kickier.
Crude-as. Under-engineered. Sufficient for my porpoises.
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