I would say Darlington Gun Works(Jim Kelly) in South Carolina as he as tightened a DR for me, but Jim is up in age and has a Grandson as an apprentice & a few here have experienced less than satisfactory results.

https://www.doublegunshop.com/forums/ubb...true#Post573287

Then there's New England Custom Gun, but with that there's a shipment involved.

Cheers,

Raimey
rse