Okay, heres what I need, have not been able to find one anywhere.
Basically, I need a thread adapter, barrel extension to bring a 14.5 inch barrel up to legal length.
So, it would need to be 1 3/4 inches in total length. And have a 5/8 24 female, and a 1/2 28 male threads. I can furnish the OD needed to match the OD of the barrel where it touches it, as well as the minimum depth needed for the female threads, and the threaded length needed for the male end.
Construction would have to be stainless, as this is a permanent extension, finish smooth, blackened if you can, if not I'll kryonize it.
If you can provide a cost based on this info, great, if not, email me for more details you need.