Try contacting the maker.
No known web site.
You can download one from the Browning website.
Go here - www.remington.com/literature_request/literature_request_form.aspx
If you are looking for the owners manual go to the Crosman home page and click on "download a manual" you will find the 500 owners manual there.
Go to ( See the link below ) and find your parts and owners manual for your gun or rifle. Crosman keeps a web page for older airguns.
Contact Winchester Customer Service through their website.
Follow this link to contact Winchester, and request a manual: http://www.winchesterguns.com/customerservice/ownersmanuals/index.asp
Tesco, Brighton
Please list ALL the markings on the rifle so we can properly identify it. sales@countrygunsmith.net
You can find the owners manual on the Crosman home page. click on "Download a manual" and locate you rifle for the instructions. See the related link.
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.
Try eBay, most of the copies are reproductions but they'll have all the info.