At a recent gun show I picked up two Brno rifles in 7x57. One made in '48 is a standard configuration action, nicely done as a manlicher style. It had an unusual bolt in that it is a '98 action but the bolt does not have a anti-bind guide rib on it. The second rifle, the carbine, had double square bridge configuration and a standard bolt with the bolt guide rib, made in '50. Why the difference? Both rifles are in very good shape.

What you have are most likely small ring 21-H (half stock) or 22-F (full stock, Mannlicher) models. From about 1947-1948 they were made in standard Mauser configuration, with knurled round top receiver and bridge, bolts w/o guide ribs. From 1949 through early 50s, they were made with "double square bridges" for mounting scopes, and guide ribs were added to bolts. All I have seen of both configurations have butterknife bolt handles, most have double set triggers. Two barrel lengths were available. About 40,000 of both configurations were made. The ZG-47 was a large ring model, introduced about the same time, but most (approximately 20,000 total) were made from 1956-1962. Alf Smith can tell you all about them, as he has done on previous posts.



ZG-47 (custom stock):







21-H (made in 1950):

Those are the ones. The little 7x57's are quite nice. In the other post you said you would not use one for a 404 Jeffery. Why not? Is the small ring that significant in this caliber?

The small ring might be strong enough, but seems like the action is a little shorter, the magazine is definitely smaller. If you used a Blackburn magazine, and opened up the rails, ramp, I suppose it might work. You'd probably want to change the safety too, and of course restock. I just don't think a small ring action is appropriate for something as large as a 404, even if it would work.