Truglo Pro Series Mangum Gobble Dot sight model TG944C or the 6mm size. $30.00 shipped.
(http://s1142.photobucket.com/user/goats260/media/IMG_20160918_132430827_zpsqqeynh50.jpg.html)
(http://s1142.photobucket.com/user/goats260/media/IMG_20160918_132439496_zpsx2qj3m3c.jpg.html)