Which one and what caliber?
Also define great shape in great detail, great case colors?, great wood? great bluing?
Also I suspect the 1886 your referring to is a patent date which means it could have been made well into the 20th century.
I saw one recently at a gun show, they can range in price from 300 to 500 dollars.
In the year 1890,as a model No.4 rolling block rifle.
There is no one rolling block rifle, and no one answer. Most are held on pins that must be pushed out with a pin punch.
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.
Features and markings.
Which model?
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.
100-1000 USD
Not enough information to even hazard a guess.
Will have to be made.
fifteen hundred
50-100 USD