I'm thinking that magazine can be made to work and you will likely have to do something to any other mag as well, unless you rob a known functioning unit from another rifle and it just happens to fit.

The feed lips will bend quite readily. you may even be able to drive this one in with educated blows of a soft faced rubber mallet. The mallet taps will at least show you where the high spots are that can be massaged down. Fitting your first magazine might take an hour or three, but it can usually be done without removing metal. Just controlled reforming. After fitting, don't remove and replace the magazine except for general maintenance. It's not for quick mag swaps! Reloading is done via chargers from the top side of the rifle. That or single rounds also inserted whilst the magazine is installed.