I too have old eyes, it's really hard to get a decent group with that front sight blurring in and out, up and down. i snagged a cheap bsa reddot off e-bay for 10.99, put it on a new , drilled and tapped kmk512 mk II.got one inch rested groups today with it, with the majority going into less than half that at 25 yards! thats good for me, squirrel head accuracy.and with the factory weaver base, if the reddot goes sour, i can pop it off and use the irons, the base is not visable shooting irons.i can now shot the possums at night that invade the trashcans too!