I have heaps. I contracted Lothar Walther to make them for me and I’ve got standard and H profile as well as more no4 barrels in .303 and .308 due late this month.
I export to Canadaand NZ
and I don’t charge for the export permit.
These are great barrels and do the job well.
For fitting you need to take up the last 35 degrees to time them and finish chamber the last few thou to get them to headspace. If you can’t manage this you shouldn’t be fitting barrel.