The Jericho barrel is interchangeable with a small frame Tanfoglio Witness barrel. At least with the samples that I have played with. They drop right in.
They made/imported six inch small frame Witness barrels at one time....not sure if they still do.
A large frame barrel won't work in the early Jerichos.
I think the Jericho is now made in 45 ACP, so that would take a large frame....I don't know about those barrels.
Tony