Savage, I use a Weaver K3 on a similar mount to clear the rear sight leaf. Here's a set of Brno see-through mounts. Note how high they set:







Here's a ZG-47 mount similar to yours only made of aluminum:

The members on this site are fabulous. I would take forever to find out all of this valuable and interesting information without the internet.

In the mean time this K-4 is going on.



I am still interested in feedback on the optimum scope for this M21. A new Leu, while good optics, is not of the right generation nor European enough.

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Alf, Lo and behold,eh? The squared off sear at spring pocket was one of Albert Speer's dictums when he was Reichsfuher of Produktion. The undercuts on receiver another. The bent sheet metal mag boxes needed squaring off the receiver match top of the box. It speeded up fitting the parts to eliminate a filing operation. The forming operation resulted in some metal thinning out and creeping upward on the box sides. The coarse milling marks at side of the sear were typical of the Chech procedure. Now that you have gone into your secret hoard have some more fun. Check the height from bolt bodies to the top of the bolt handle at the root section where a very low mounted scope could contact the surface. ( on the '20-'21's). The fire pin front end just beyond the spring collar can be another revelation. You may also find that they sometimes used altered milled magazine boxes instead of the sheet metal boxes. The bolt stop springs when red coloured (hows that eh?) are so because they are the substitute material specified by the waffenamt. The bolt stop that has the poor polish job may have had that from the factory also. Towards the end the G 33's were like this.

My copy of a thermo copy of an article in the Itallian journal "Diana" claims that the ZKK's were started, for production in late 1963 and that there were really no deliveries of consequence until 1965. Your scope mount break down shows a 65 along the inside fold . The only version of the modified base for the ZKK's I ever handled ( long enough to decline)was a bronze type alloy casting. I was convinced that it weighed near a pound by its lonesome. George McQueen of Mc Queen's Ltd. was even less impressed.

You have recently acquired a neat book. You have not mentioned it but how about.....

Geschichte der Mauser Werke, Berlin VDI Verlag GMBH 1938,
C. Matschoss.

That would be a great one for reprint or on a CD at the very least. It has quite a few neat pictures of manufacturing in production of the Mauser with attention to some of the fussy details of the processing.