What optic would you recommend on your 7.62x39 Saiga that is going to be used primarily for a SHTF situation and self defense? I'm trying to decide between a PK-A, Kobra, and POPS. I want to use the side rail. Also, i live in a suburban town between the inner-city and rural towns, if that helps at all. I would prefer to use a Russian optic since it's a Russian rifle.