The optic is a Primary Arms 5X prism sight. I'm not that familiar, this is my first one. They are kind of a poor-man's ACOG. They seem pretty sturdy. The reticle is nice, etched glass with red and green illum.

http://www.primaryarms.com/primary-...-223-5-56-5-45x39-308-acss-reticle-pac5x



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