Nah, it's just rubber that wraps around and fits over the top turret cap. Covers the side cap compleltely so it's only a bit of pain to unwrap that part and make any adjustments to the scope. Once sighted in, no problem at all. Just throw the Undertube in the washwater! Some of those others I've posted were meant to be over-the-top jokes. But that slidin' one will work if it will stay put.