For a double rifle like this you only have one rear and one front sight, placed in the middle between both barrels. The trick is as a shooter to try and figure out at what yardage and what load that both bullets come together down range.
The gun makers would use shims between the barrels and then shoot the gun before the ribs are completely soldered on. Adjust the shims for up and down, left and right. With one set of sights, you want the point of impact fairly close for both barrels.
This rifle is for game up close. Not a long range rifle. Likely for dangerous game, hence two barrels and two shots.
My guess is that 50 yards or so both barrels will be fairly close. I have heard people say that acceptable accuracy for a double ML rifle is a 12" group I think at 100 yards, might of even been 50 yards, cant remember. Someone that knows, please chime in.
Shooting a double rifle can be a real PIA trying to figure out how to get both barrels to come together. This is my third double rifle. After my second one I said I would never buy another.....but my memory is not so good apparently.
A double rifle like any of the modern made ML has two rear sights, one for each barrel. Makes it cheaper to produce and easier for the shooter to sight in the rifle. Also looks like $#@* IMO.
Fleener