I ordered a Williams Firesight Universal for vent rib shotguns and intended to put it on a Remington 11-87. The sights feel well-made in the hand, and they usually have a lead time and back order. They feel better to the hand than the Tru Glo mag. But the bases for mounting the sights will not fit under the rib on my gun. It was probably made in 1999 or 2000.