I have had one since it was new back in 1985. I think that they are wonderful pistols. as for a magazine, i found on online a few years ago. just don't get one that says it is conpatible with the buckmark as that are very different. From what i recall, you need one that fits a challenger II & III.
here's the site that i found mine at and they still list the magazine:
http://www.ammoclip.com/b/browning_c...ger-ii_iii.htm
Ok you may waht to just copy and paste
http://www.ammoclip.com/b/browning_c...ger-ii_iii.htm