Hey forum! I have discovered yesterday that the NORMAL Stanag 30 Rnd. mags are only usable in the non- SD weapons, though the SD Stanag 30 Rnd. mags are usable in both, SD and non-SD M4A1. It sounds kinda weird to me that there are 2 different kind of clips for SD and non-SD weapons. After all, the silencer is just an attachment and doesn't really depend on the ammo, right? Correct me if I'm wrong, otherwise I'd like to see some changes :) LeNger