Quote Originally Posted by georgeib View Post
Interesting, thanks for posting that. If you weren't already aware, however, the purpose of the killflash isn't so much to keep the reticle from being visible from the muzzle end, but rather to hide reflections from the objective lens which can compromise your position to an enemy. A killflash is also known as an ARD, an Anti Reflection Device. FWIW.
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.