You get some with different shaped dots which are selectable by rotating a knob, or by a lever.. Some dots are surrounded by a ring for quick target acquisition, others are an empty ring etc. You CAN shoot a sub 3moa group with a 3moa dot, the only problem issue is the larger dots obscuring the target..
Make sure your red dot sight has click adjustments. Ones with smooth adjustments and lock screws are a pain.
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