the first action is a 12 gauge ,it is a GECO but it looks exactly like a mekel action
the second one is a jp sauer & sons 16 gauge action
the question is what modern cal can be built on these actions
http://www.flickr.com/photos/36972995@N04/3405361560/
http://www.flickr.com/photos/36972995@N04/3404549833/