Yes it can provided you can find the .22 barrel. Beeman makes a dual barrel .177 & .22 rifle
Requires hand on inspection.
There is a .50 replacement barrel on Gunbroker.com
marlin 35 cal. lever action. rifle/ Marlin makes the rifle ,but not the ammo for it.
Condition?
Depends on what you have.
Remington.
To take apart the Gecado .25 caliber rifle, you will begin by making sure that the rifle is not loaded. Remove the retaining pin at the base of the barrel and remove the barrel.
Remington did not make a 44 cal double barrel pistol. The did however make a 41 cal (rimfire) the double derringer. (model 95) There's 3 type's, 5 models, and at least 15 variations some of which are quite valuable.
Someone put it there to read the letters.
10-1000 or more depending on specifics.
50-175 usd