It really depends on what range and how fast you want to engage your targets. At 100yds or less I would go with a Eotech or a Aimpoint if I were looking for a defensive weapon. For any kind of precision past 100yds I would go with a scope I prefer a 4-16x50mm but that's just me.
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“The problem with socialism is that you eventually run out of other people's money.”
-Margaret Thatcher-
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