BUT, I still say that it's simpler to modify ONE mag catch than six or twelve magazines. It's simplcity itself to modify the mag catch. Silver solder a 3 or 4mm thick piece of steel across the front nose and file it to form a bulbous nose shape. Gently file, fit, file, fit, file, fit....., carefully as you go and it'll all fall in place. Believe me, they didn't spend too much time and money on the conversion. Over the next few days I'll photograph one and get some whizz-kid to put it up.

On second thoughts, given the total area of the block of steel you're going to use, soft solder will probably suffice.......