I have one S&B, a 4x Classic, and even that scope is right at 16 oz. They get heavier from there. The optics are very fine and perhaps with present knowledge there is no way to make them lighter while keeping the same toughness and quality but I don't know that for a cold & hard fact.

I do know that for my hunting rifles I generally want a lot lighter optic and also realize I may be sacrificing something in durability and optical quality by my other choices but that's often subjective too. And, that's not to mention there quite high price, sometimes 2x to 3x the competition.