Alittle late for the main thrust of the thread, but here is my M17(?) combo in a smoothbore 16ga and a 12.7x44R rifle barrel. It is a pretty standard gun with no frills. The sights are a three leaft up to 300 meters. A nice thin blad that is adjustable for windage. The sights are rifle sights and not really what you would use for flying targets. I have yet to shoot a ball load in the smooth bore to see if there is any regulation of the barrels. Soon.