Many years ago, in the 1980s, I toured a shop in New Hampshire called Pine Tree Castings and saw racks with what surely appeared to me to be PPKs frames being made there. I was there for the Ruger Armourer’s course, on the same property, different building.
Pine Tree Castings was Rugers owned and operated Investment Casting facility.
They did all the castings forRuger of course but took on contract work from much of the rest of the firearms world as well as other industries.
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Interarms was never a mfg'r of Walthers. Just an importer of the German product and marketer of the USA made version.
The USA made version came about becasue of the GCA68 ban on importation of the PPK.
Make it here was the solution. The popular PPKS and the TPH got made here as well.
The actual job of mfg'g the USA Walther pistols was given to MidSouth Industries in Gadsen (sp?), Alabama.
Midsouth had many corp names under the Midsouth name, one of which was Ranger Arms Co. Under that mfg name is what the Walthers were made in the USA.
This is the info I was given on the Walther Forum as to the time-line of sorts about the USA mfg of the PPKs/PPK
Investment cast parts were used for many of the components and I wouldn't doubt that Pine Tree and other firms in that business had provided the service.
It's a specialty business and not something that makes sense to set up on your own.
Ruger did at the time as no one else could provide exactly what he wanted for his style of mfg'g. So he built his own in NH.