Check the Beretta website.
Contact Beretta, and request an owner's manual. See the link below for an on-line request.
I suggest contacting the Manufacture and request an Owners manual. See the link Below
Request a manual from the maker.
The original manufacture of the Iver Johnson Model 55 Target pistol maybe able to provide an owners manual. The manual will have instructions on what is need to maintain the product.
Contact Berett for a owner's manual or find a gunsmith and ask for help
Send me your email & I'll send you a scan of the manual.
Follow the instructions in the owners manual. If you don't have one, go to the makers web site and request one. If the maker is no longer in business, take it to a gunsmith.
You can request a manual from Colt.
You can request a manual from Ruger on their web site.
Request a manual from Ruger's website or take it to a gunsmith
You will have to call Beretta
Request a manual from Ruger on their web site.