Yes
Gun shop, gun show, old catalogs
No.
Library, gun shop, gun show, appraiser.
Go to a gun shop or gun show with money, be of legal age and with no law violations.
E-gunparts.com, gun show, gun shop, want ads, internet
Gun shop, gun show, on line auctions
No!
gun shop, gun show, want ad, pawn shop
Old gun catalogs, auction sites, gun shop, gun show
go talk to the old man
Go to a Hardware store and show them the old o-ring and see if they have a matching new ring. Most stores do. Or you can contact the manufacturer.