Ok, I got two barrels in today. Here is the run down; I will be using an Imperial .30 Luger for comparison. I will only mention dimensions that differ from the original barrel.
Side by side
Shank New=.864" Old = .859"
Forward of the flange New = .738" Old = .639"
Muzzles New = .542" Old .545"
I think that I might turn down the very tip and have a regular band installed.
As you can see the chamber is a little deep. But it can be fixed, as the flange is thick enough.
Hugh email me!