I am wondering if anybody knows of if this combination gun exists?

- 20 or 16 cal shotgun
- 7x57R rifle
- Barrels brazed togheter, not free floating
- Single trigger, but with ability to change to the barrel you need/want.
- Steel action
- Dont have to break open the rifle, to shoot next round.

I see it firstly as a shotgun, but can be switched to rifle if needed.

Am I missing something?
Aren't most such?

Unless you mean a drilling in which case you always have two triggers.
And to break open before the second shot? Never heard of that... Some modern guns have a cocking lever, yes; but it's used before the first shot.

Try Antonio Zoli, Brno (OK not in 7x57), Blaser K97 (I think - not quite sure), Merkel 2010 series etc.

- Lars/Finland

The heym combo guns have one trigger to fire both barrels. At first it looks like a double trigger gun, but the rear trigger is a set trigger. You select the barrel with a button on the left side of the receiver. I would own one if it were not for that feature. I much prefer two triggers.

Good point!
This might well be the case with many other German made guns. It's not uncommon for the combos to have set triggers.

So the buyer might want to check the spec sheet besides the photos

- Lars/Finland

Blaser B97.