I have a 18” 223 ar15 used mainly for target shooting but want it to be usable in a shtf situation with ranges of 0-500 . I’ve been researching scopes but I can’t decide on what magnification to get. I originally wanted a 1-6,8,10 but after reading I’m leaning more towards a 2-10 with a offset mrd. I like the price, availability and reviews of the viper pst vrs say razor 1-10 or 1-6. Thanks for any suggestions.