Yes, clearly NOT shot-out, nor worn...but darned if it has/had any rifling.
I am friendly with a LGS/Pawn manager that gave a loan on it. Is this an odd-duck, or rather commonplace ?
The condition of this Broom is a fairly typical example of a Mauser C96 that was sold to China, saw service, and was later (during the late 80's and early 90's) re-imported into the United States as surplus; I believe a Clinton era ban on Chinese weapons ended these imports.
I have one that has lost most of it's rifling, similar to the example pictured. Firing normal .30Mauser ammo (with a .308dia bullet) would cause the projectiles to keyhole (as it will in yours). In my particular bore, firing handloaded lead hard cast boolits sized to .311dia got me back on paper, punching round holes. You could try that, assuming you handload and want to get shooting again with the least investment in time and money; this would keep it "original" since from here, it seems to be a mostly "numbers matching" gun.
In your case with this Bolo, it won't mean all that much that it's numbers matching, since the original finish is gone, the bore has no rifling and there is likely deep pitting under the wooden grip panels. But if one were to work on it to get it to fire, at least the action would unlock smoother when loading, and it would come apart and back together again smoother when field stripping, if the parts were "numbers matching" as it had left the factory.
Alternatively you could have a gunsmith re-line the bore with a .30 cal sleeve or have it re-cut and bored over to 9mm Luger. I looked into this just last week; both of these jobs used to be pretty common work, it's even got honorable mention in George C Nonte's
"Pistolsmithing" book, but there are so few real gunsmiths out there that are willing to take on work like this anymore.
Redman's Rifling and Reboring out of Omak, WA used to be a go-to smith for relining. As of this writing in Mar/2025 currently, his website says he's not taking in new work.
Just last week I called PISCO Gunsmithing in OR (of AGI Institute fame) to see if they would thread my 9mm P08 Luger barrel onto my C96 upper and they wouldn't take the job, though they'd be willing to perform a re-line job (not an option since the project upper I have is already chopped).
Finally there's Lugerman in PA, who seems to offer either a reline or re-barrel as options on their website though I have not yet used Lugerman myself personally.
I have rebuilt several Broomhandles and enjoy shooting them. Prior to 2020, your patina gun would have fetched $500 to $700 max on Gunbroker as a poor condition blaster or as a project gun. Today you can't even touch a Broom in this worn janky condition for less than $1k.