Crosman owns both Sheridan and Benjamin line of air guns/rifles. Crosman has MOST all of the Owners and Parts manuals online. They even offer a free service to locate shops that repair older Benjamin, Sheridan and Crosman air guns. See the links below.
At one time Sheridan, Benjamin and Crosman were all separate companies. In the 1970's. Benjamin bought out Sheridan and took over the company. In the 1990's Crosman bought out Benjamin. Now Crosman owns all 3 companies. When Benjamin bought out Sheridan they decided to keep the C series design. So they decided to keep the Sheridan name on the .20 mm air rifle and put the Benjamin name on the .177 and .22 caliber 392 series air rifle that looks just like a Sheridan C Series. So All Sheridan C series are .20 caliber and the .177 and .22 are Benjamin's. Crosman decided that this worked well and kept the same arrangement for both models. If you go to the Crosman home page you will find (At the bottom of the page) a link to (Owners and Parts Manuals) there you will find the owners manual in the Benjamin / Sheridan section.
today. Crosman corp owns both Sheridan and Benjamin air guns / rifles. See the links below.
Crosman Owns Sheridan Airguns along with Benjamin airguns. They offer a service to locate repair shops that repair older Crosman, Sheridan and Benjamin air guns. See the link below
If the rifle is still under warranty then you can send it back to Crosman. Crosman owns Benjamin and Sheridan brand of air guns. (See the #1 link below) if it is an older one, then Crosman offers a service to locate repair shops that repair older Crosman, Benjamin and Sheridan products. see the #2 link below.
I suggest that you go to the Crosman homepage ( they own Benjamin) and click on "Download a manual" there you will find the owners manual and parts diagram for your rifle. See related link.
At one time Benjamin, Sheridan and Crosman were 3 different companies. Benjamin bought out Sheridan and later Crosman bought out Benjamin. So now Crosman owns the rights to all 3 companies. See the link below for your answer.
NoBenjamin Sheridan is now owned by "Crosman air gun." Go to (See the link below) and on the home page click on "Find a service center" at the bottom of the page. Fill in the information and It will bring up a page that list several places that repair older Benjamin air rifles and guns.
These are exceptional rifles but are one of the most confusing to identify by age. I almost hate to try to identify these but I'm going to try. Here is some history: Sheridan first made this rifle. Benjamin air rifle bought them out and continued to make the rifle. Later still, Crosman bought out Benjamin and continued to produce the C series rifle. Some times it was marketed as a Benjamin/Sheridan later Crosman separated the rifles into two categories, .177 and .22 caliber rifles. These were marketed as "Benjamin rifles" and the .20 (5.0) were marketed as a "Sheridan rifles." (Same rifle, just different calibers.) Crosman also produced the C9, CB, CBW, CW, CB9, C9BP. Some were called "Blue streak" and some were called "Silver streak" depending on Color. In some places you can find Sheridan and in other placed you can find Crosman in the instructions. I believe yours was made sometime between 1998 to 2000. (Best Guess) Foot Note: at one point Benjamin marketed rifles under the "Benjamin Franklin" name as a marketing ploy. Benjamin Franklin had nothing to do with the rifles it just sounded good for sales.
Benjamin is owned by Crosman corp. They have, on their web page, a service to locate and repair Benjamin, Crosman and Sheridan air guns. Some parts are available from Crosman directly. If it is and older part go to the Crosman link below and then click on "Find a service center" it will help you locate someone who may help you find your parts.
The Benjamin model 310 is part of a series of rifles that included: 310 BB rifle 317 .177 pellet rifle 322 .22 pellet rifle All were made from 1940 to 1969 Today Crosman owns Benjamin and Sheridan air gun's, see the link below for a partial list of Dates of Manufacture. Scroll down on the list until you find the 310 section. It may help if you have the serial number.
Crosman owns the Sheridan line of air guns. They offer a service to locate shops that repair older products. See this link. http://www.crosman.com/general/find-a-service-center