MP5-N and HK23E-K
Bought new production MP5 mags from HK a couple of months ago and getting varying array of rust on them. Three have light rust from handling them. I noticed something strange about them when I first opened them out of the factory sealed bag. The other five look similar to the one below and have be used during 2 range trips. It's not a storage issue. Either way, I've cleaned and oiled them since, but I find it interesting and figured I'd share.