I picked up a Kill Flash for an Aimpoint PRO intending it as a lens protector since I didn't care for their transparent covers and ditched it quick after seeing how dim the sight picture became.
Spun the Holosun ARDs off as soon as I got them for the same reason. As has been pointed, those are really silly since the Holosuns come with(excellent in my opinion) actual glass flip lens covers front and rear.
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