Sound seems to be coming specifically from 40 cal mag which causes sounds on the slide, I have just noticed recently but when u have a mag at full capacity and put it in then it’ll cause a weird rattle or clanking sound if u are to tip it forward and back which I assume may be the firing pin maybe? I found this out on my g23 but also tried this on a g27 got the same sound and even a g19 with the g23 mag in all of them and it still made the same sound with the slide but if you are to pull one round out of the 13 round magazine of the g23 then the clinking sound of the slide completely stops.. tldr.. have been trying to look on this sub all over for any fixes near to this because I don’t want a unintentional discharge but have seen barely any talks about this, may just have to roll with one less in the magazine is what I’m thinking all the fix will have to be for now but some input if any is appreciated, thanks!🙏