Before the use of the Infallible Single Trigger is engraved in stone, do we know how this trigger works? Let me give a synopsis of operational peculiarities. If we fire the right barrel, open the gun to reload, the next barrel to fire will be the left. If we fire both barrels, right barrel first, open the gun to reload, the next barrel to fire will be the right. This is a system unfamiliar to all modern shooters. It requires a movement of the selector every time we fire only one shell. The Infallible may be fairly reliable as ninety year old single triggers go, I use a couple of them myself, but is probably far from the best available today. It also requires a big hole and a big button to the left of the top tang of our new gun.