I just picked one up at a gun show today. However, they sometimes come up on eBay. For mine, with an original scabbard (which is very rare), I paid $200. Without a scabbard, I'd say a fair price is between $120-160, but you may be able to get one cheaper. They also appear sometimes on specialty collectable bayonet sites, but it would probably cost $250-$350 with a scabbard.
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.
A rifle with a bayonet.
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.
No.
When the bayonet is fixed to a rifle, it is called a parry.
The blade on a RIFLE is called a bayonet.
Not enough information to even hazard a guess.
50-100 USD