This double-barreled sporting rifle made by Christoph Funk in Germany is not much like the typical over-under double-barreled rifle. It began as a fairly standard Mauser bolt action, chambered in 7×57 Mauser with a 5-round magazine and a nice double-claw scope mount. What Funk added to this was a .22 caliber rimfire action and barrel inside the front handguard of the Mauser action.
The .22 action is simple, and its barrel is very light – their addition does little to disturb the balance or handling of the gun. A striker cocking lever was added behind the Mauser bolt to actuate the .22 firing mechanism, and what appears to be a double set trigger is actually a trigger for the Mauser action and a trigger for the .22 action. A very clever way to allow a sportsman to have a round of proper rifle ammunition ready for medium game while simultaneously having a round of .22 rimfire ready for a shot at a small game animal.