И аз съм го виждал това за руските биатлонови пушки ама не съм се замислял. Май си прав сигурно Anshutz купуват цеви от валтер за ловните.
http://www.lothar-walther.de/html/107.php

Ето какво намерих в нета:
"Button rifling in its common form is an American development and the overwhelming majority of barrels made in the US are rifled this way. Custom shops such as Hart, Lilja, Shilen and the large high production barrel makers like Douglas and Wilson Arms use the buttoning method to rifle their barrels. The technology has spread and there are a few other small custom barrel makers around the world who do button rifling. Neville Madden (Maddco) and Dennis Tobler in Australia. Anshutz in Germany, better known for their .22 target rifles but also a large producer of hunting rifles also button their barrels.

In Europe, where larger more centralised armament factories predominate, the cold forging method of making "hammered" barrels is generally preferred."

Сайта е тоя:http://www.firearmsid.com/Feature%20Articles/RifledBarrelManuf/BarrelManufacture.htm