As someone who has rebuilt firearms for awhile, sometimes you have to let a firearm go or let a search lay dormant for awhile. A few projects are going on five years now but I am careful about the price that I pay and not willing to buy additional stuff if I don't need it. A few times I missed the boat by hesitating but it all works out in the end.
Your best bet is to know exactly what part you are looking for and have pictures of the needed bolt to compare so you can swap with seller to determine if you have the right part or you buy a donor parts rifle.
Then, you will basically have to troll somewhere like Ebay for miscellaneous rifle/shotgun bolts that the seller does not know what they have or set up alerts from the various auction sites if something comes up.
Hoosier Gunworks which are fine folks have a bunch of unidentified bolts for all sorts of shotguns and rifles that if you send pictures to them, they might be able to locate a matching part. I believe they also go around to gun shows in the area and might be able to acquire one for you if you ask nicely. Lee's Gun Parts is another good seller and their inventory is NOT online so you will have to call them as you would with Bob's Gun Parts mentioned above. A lot of the old timey sellers do not have everything online as it is more trouble than it is worth for low turnover parts.
If you stick around on the auction sites long enough, you learn who are the reliable sellers and who are not. I'm always cautious on sellers with only a few reviews. Over the years, I've made over 500-600 purchases on auction sites (not the listing sites) over the years and only got outright fraud in a few low dollar cases--one of which was a book of all things. A few parts were not correct also. But then again, I've had bad sellers on Amazon. Like gambling, only spend what you can afford to lose.
Your best bet is to know exactly what part you are looking for and have pictures of the needed bolt to compare so you can swap with seller to determine if you have the right part or you buy a donor parts rifle.
Then, you will basically have to troll somewhere like Ebay for miscellaneous rifle/shotgun bolts that the seller does not know what they have or set up alerts from the various auction sites if something comes up.
Hoosier Gunworks which are fine folks have a bunch of unidentified bolts for all sorts of shotguns and rifles that if you send pictures to them, they might be able to locate a matching part. I believe they also go around to gun shows in the area and might be able to acquire one for you if you ask nicely. Lee's Gun Parts is another good seller and their inventory is NOT online so you will have to call them as you would with Bob's Gun Parts mentioned above. A lot of the old timey sellers do not have everything online as it is more trouble than it is worth for low turnover parts.
If you stick around on the auction sites long enough, you learn who are the reliable sellers and who are not. I'm always cautious on sellers with only a few reviews. Over the years, I've made over 500-600 purchases on auction sites (not the listing sites) over the years and only got outright fraud in a few low dollar cases--one of which was a book of all things. A few parts were not correct also. But then again, I've had bad sellers on Amazon. Like gambling, only spend what you can afford to lose.