If you have a semi-new shotgun, you can pickup the gun buyers guide from borders or a local book store. If your talking an antique shotgun, then they may have books for that, but I have not looked into it before.
User manual
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The value of a Westpoint shotgun will depend on the weapon's condition. If in excellent condition the shotgun is worth $500.
how much is a gauge victor ejector shotgun worth
This model Cross refernces out to a Remington Sportsman 58, introduced in 1956, the Sportsman-58 was Remington's first gas-operated shotgun. You can request an owners manual for obsolete firearms at www.remington.com click on sportsmans library, then downloads, then owners manuals, then click obsolete owners manuals, you will have to register but it is worth it to get the free manual.
No such thing as a 22 Shotgun.
Your shotgun is a Mossbeg 500. made by them for Sears. Go to the Mossberg website, customer serivce, owners manual, and download the manual for your shotgun.
I have the same shotgun.
Check with Mossberg (500).
www.smith-wesson.com
Follow the instructions in the owner's manual