The three forum threads that are currently running "Is anybody using these", "Vortex Viper red dot" and this one got me thinking. I have an acquaintance who has a Browning model 1886 in 45-70 that is factory drilled and tapped for the Lyman/Willams style peep sight. His eyes are where mine are headed and his rifle has a Burris red dot sight (Fast Fire?) mounted back by the rifles hammer. It is mounted on an aluminum piece of angle iron that is drilled to correspond to the factory holes and a couple of holes to screw the red dot down. It sounds weird but works pretty slick. And it doesn't inter fear with ejection at all. Its low not much higher than the factory sight and compact and doesn't hinder the bolt movement. It also allows him to keep hunting with a rifle he likes which is the best part. The basic mount looks like an inverted "L". One leg of the "L" on the receiver and the other "L" leg with the red dot over the action.