www.ithacagun.com/downloads/model_37_field_maintenance_manual_090402.pdf
If the model is set up for that, follow the instructions in the owner's manual. If you don't have one, go to Ithaca's web site and request one.
Contact Ithaca for a manual
Yes, there is an owners manual available for a Charles Daly Model 500 double barrel shotgun. Various sources can be found online.
Ithaca may still be in business. Search for them on the internet. Check auctionarms.com, gunauction.com and eBay for owner's manuals. You will find a link to the Ithaca firearms schematics page below.
you can get one at: http://www.e-gunparts.com/product.asp?chrProductSKU=PDF0173
It should be listed in the owner's manual.
Follow the instructions in the A5 manual using the link below.
Google RST Manuals. I recently bought one for my Ithaca/SKB XL300 for about $7.00. It is a factory re-print and taught me everything I needed to know. They were very good to deal with.
If you have a Model 30 pump shotgun, the barrel is not intended to be removed by the user. To do so requires specialized tools such as a receiver block and a barrel wrench. You can clean and lube the shotgun with the barrel attached to the receiver. Contact Savage Arms Customer Service and get an owner's manual for your shotgun.
Send me your email and I'll send you a scan of the manual. I need the owners manual for the Ithaca SKB 500 O/U shotgun. Please e mail me with a PDF file or scan at temcowilly@aol.com. Thanks Bill
You can request a manual from Remington on their web site.
You can find these numbers in the manual that come with your gun. They are also present on the handle of the gun.