Depends on which model and condition, condition, and condition....
In order to determine the exact value of a Remington Rolling Block rifle, a few different factors would need to be taken into consideration. Some of these things would be the age and condition of the rifle.
Civil War was 1861-65; obviously, the Remington rolling block came out later. Is it a military rifle? What caliber? What condition? All these things affect value. Ranges of rolling blocks are from $550-$4000.
Not enough information to even hazard a guess.
About $500 and up.
Which model?
Hexagon barrel what? Model? pump, rolling block, ?? Condition?
The Rolling block was made in 1907
In the year 1890,as a model No.4 rolling block rifle.
Depends greatly on which model and more importantly ORIGINAL condition, condition, and condition.
My research indicates about $300.00 in good condition, and that is for a model 4 in .32 long caliber.
You will have to contact Remington.
The 20 ga shotgun was created by reaming-out the 50 cal. militery musket. I have only seen one.