Hello,

I have several rifles of the mentioned type:
Mauser 4000 in .222 Rem
Mauser 2000 (?) in 9,3x64 and 8x68S
Heym SR10 in 9,3x64

All of these have the unique safety (pushing down for "fire", pushing up for "safety").
The safety seems to block the firing pin.

Precision was tested for the Mauser 4000 in .222 Rem, Mauser 2000 (?) in 8x68S and the Heym SR10 in 9,3x64 and was excellent for all three rifles:
5 shots below 20mm at 100 meters with handloaded ammunition were obtained with all rifles and even better in .222 with several loads.
Trigger pull is good at about 1000 grams to 1400 grams and crisp.

The position of the front trigger (set trigger configuration) is not the best for small hands, but manageable.
I do not know whether Heym in Germany has standard triggers for replacement of set triggers.

The action is a push-feed, not a controlled round feed.
The ejector mechanism is a spring loaded pin in the bolt head, the extractor is a spring loaded claw.

Wood is normally in the standard configuration, for the upgrade I have no information available.

I use the .222 as a training rifle and for fox and raven hunting, the 9,3x64 Heym SR10 would be a nice rifle for Africas plains game as it is a reliable weapon.

I can recommend these rifles, although spare parts are not easily to obtain.

best regards
Rolf