Even if you never use the rifle barrel it's worth $550 as a double 16ga.
I'd probably pull something in my shoulder whipping out my wallet it to snag it for $550 assuming it's in decent shape. Even with an oddball rifle chambering you're hard pressed to find a shootable drilling for anywhere near $1000, more likely closer to $2k.
Brass and dies shouldn't be too big of a problem.
