There are several variations of this rifle. The CB Blue Streak and the CB9 Blue Streak along with CW and CBW with Williams Peep sight. Crosman owns Sheardon and Benjamin. During the 1990's they put both name on the rifle. Later they separated the names again.
Unfortunately you did not state the condition of the rifle so no estimate of value can be given. Is it Excellent, Very good, Good, Fair or Poor? Re-post you question with the model name and condition so I can give you an estimate.
Here is the link to all of the manuals for Sheridan and Benjamin. Crosman owns Sheridan and Benjamin See the link below.
There are 3 versions of the Sheridan Blue Streak. See the link below for the 2nd version. BTW today Crosman owns the Sheridan and Benjamin line of air guns. This link is from Crosman
This is possibly the most frustrating airguns to nail down as to the exact model. First of all let me explain. Sheridan was a standalone company. In 1977 Benjamin purchased Sheridan. Some guns were called Benjamin/Sheridan, in 1992 Crosman purchased Benjamin and Sheridan. They decided to call the .177 and .22 caliber rifles "Benjamin" and the .20 caliber rifle "Sheridan." But for awhile they were called "Benjamin/Sheridan." So now we have the models C, C9, CB9, C9PB, Along with Blue Streak and Silver Streak. Not to be confused with the Crosman/Benjamin "Super Streak." (Confused enough) Okay here is what I think your value is according to the Bluebook of airguns 9th edition. in very good condition it is worth between $105 to $135
today. Crosman corp owns both Sheridan and Benjamin air guns / rifles. See the links below.
The Blue Streak has been in production from 1995 to present. If you want more Information I suggest you contact Crosman who owns both Benjamin and Sheridan. See the link below.
Sheridan has been making air rifles since the 40's. Sheridan was purchased by Benjamin air gun co and eventually Benjamin was purchased by Crosman air gun co. All the reference material states that the 20 Cal Blue streak was introduced in 1995 and is still in production. Bluebook of airguns says that there are 4 variations of the Blue streak. It also stated, depending on the version, that value for one in Very Good condition would be around $135 Plus or minus. For the owners manual see the link below.
It would be worth between $65 - $80
The Sheridan Silver streak air rifle was made from 1949 up to the 1990's after that it became the Blue Streak.
The Blue Streak went into production in 1995 and is still produced.
I believe you are asking about a Sheridan .20 cal Silver Streak or Blue Streak. This model is still in production today. A brief history. Sheridan, Benjamin and Crosman were all separate companies at one time. In the 1990's Benjamin bought out Sheridan but continued to market the Sheridan .20mm air rifle. Benjamin made an Identical model called 932 (.22 cal) and model 937 (.177 cal). The .20 cal stayed with the Sheridan. Later Crosman bought out Benjamin, but has continued to make the Sheridan and Benjamin series. If you still want an old one then I suggest you try "Gunsamerica" online they occasionally get one, or Gunbrokers online. See the link below.
how do i remove the air chamber on a sheridan blue streak Next time don't place any part of your question in this box. Or the systems thinks your question has been answered. This is the Answer Box not the Question box. To answer your question (see the link below) for the parts diagram. Today Crosman air gun company owns Sheridan and Benjamin line of air guns.
Sheridan made several C series rifles. I assume that you are asking about the C Silver Streak. Not the C9 Sliver Streak. In order to give you an estimate I need to know the condition of the rifle. Does it still work? Does it hold air. What condition is it in? All these determine the current value.