Muskox
AH elite
In Germany Frankonia would not be my choice for saving money.
I knew a guy near Plochingen, he did great work on my Mannlicher. Also knew a guy in Suhl. I bet there are a lot of guys in Suhl, but that's not the issue here.
New England Custom Gun may have a solution. Another guy who did great work on a Mannlicher scope for me was Lee LeBas.
I know you're not asking about Mannlichers, but that's where I've needed help with custom scopes. Your milage may vary.
Yes Frankonia, would be bloody expensive. They charge about $500 to thread and proof a barrel for a silencer.