I'm not sure what you mean by "Mauser was the exclusive domain". Mauser type rifles were made all over the world by numerous makers, licenced and not. Some of the rifles sourced in Yugoslaviawere unissued. Many were rebuilt there. Many were made there, others in Germany or elsewhere in Europe. MM rebuilds rifles. Whether they are considered scrubbed bitsers or are desirable as anything other than shooters is a matter of opinion.