i have a rem 870 with the sage collapsable stock on it. i had the 28 inch barrell cut down to 19 or so inches. the new stock puts my line of sight much higher than with the stock stock(ha,ha). i am going to have a picatinny rail put on the top of the receiver for a reddot. but i would like back up iron sights. does anyone make something tall like the a2 sight that would fit around the fatter shotgun barrell?