I know someone who had the barrel replaced on a K98 Mauser. He said that the gunsmith told him that it took 2-3 hours to machine the receiver to fit the barrel because the steel was so hard. And this was done by a Mauser rebarreling expert who advertises on Gunbroker. He provides a lot of info. in his ad and did a nice job. I realize that it's a VZ24 being discussed but the process and effort required may be similar:
http://www.gunbroker.com/Auction/Vie...Item=306766589