Re: Badger M5 Bottom Metal
I'm not aware of any other mags for the .223 that'll lessen the rattle, but you might try a strip of tape around the mag that'll fit inside the mag well. That should take out some of the play. Not exactly a high quality modification, but a simple one that is easily fixed if you don't like it. Just don't make it so tight that the mag binds and causes feeding problems.