I cut them out of a large piece on my band saw. Took a little off the follower and relocated the spring. I'll try to take pics some time this week. There is a pic of the complete mag in the below article. It just doesnt show much of how its made, however.How do I get one of those? Wouldn't mind seeing what it looks like
http://forum.accurateshooter.com/threads/two-more-brxs.3919727/