What model is it. How old is it, what condition is it in, is it still working?
It's a Crosman 764sb air rifle.
See the link below for the Owners Manual for the Crosman 1077 air rifle
Crosman offers a service to locate air gun repair shops that service older Crosman air guns. See the link below.
See the link below for your answer
there are over 100 different model Crosman airguns. You need to specify the model and the condition of the Crosman you want to know about
The Revelation brand was made by Crosman Air gun. Crosman offers a free service to "Find a service center" on their Crosman home page. It will give you the location of several places that repair Crosman air guns. See the related link.
Crosman and Daisy made air rifles for Sears under the JC Higgins name. Yours is a model 400 Crosman. However you did not state the condition of the rifle so no estimate of value can be given. However yours was made between 1957-64.
Today Crosman air gun co, Owns Sheridan. Crosman offers a free service to locate shops that repair older Crosman, Sheridan and Benjamin air guns. See the link below.
It would help if you stated the model of the pellet gun you need parts for. I can tell you this much. Both Daisy and Crosman made pellet guns for Sears under the JC Higgins brand name. If you want to try to locate a repair shop that restores old pellet guns I suggest to look on the web under "Air Gun Repair." and locate someone who repairs older pellet guns. Or you can re-post your question with the model number it will start with one of two sets of numbers like 799 or 126. This will identify it as either a Daisy or a Crosman air gun. Crosman offers a locater service to repair older guns. (If yours is a Crosman.) It's up to you how you want to find parts.
No- and it would be very dangerous to try. Pellet guns and airsoft are two very different things.
You can find it on the Crosman web page. The JC Higgins model 180 was made by Crosman Air guns. See the link below
Yes, But first determine if it's worth it. Some inexpensive pellet guns are not worth rebuilding. Marksman makes a line of inexpensive air guns and rifles that are not considered very high in quality and may cost more to rebuild than they are worth. However Beeman (Who Owns Marksman) makes very good air guns and rifles, and would be worth the effort to rebuild one. There are several air gun shops around the country that make a living repairing older air guns. You can do a search on the web for "Air gun repair" and locate one that works on your model. Unless you are very handy with tools I would recommend one of there shops, rather than tackle the job yourself. Crosman offers a link on their homepage to independent shops that repair Crosman, Benjamin and Sheridan air guns. All these brands are owned by Crosman. So yes most air guns can be rebuilt.