I'm consolidating all my Glock mags. I have four factory G17 17rd. mags. They are all metal lined and drop free. 3 are marked LEO only and have mag followers stamped 9mm 1 and 9mm 3 near the front. The fourth one has no LEO marking and just has 9mm marked on the follower torwards the rear. So what's the skinny on the followers ? They are marked different and physically look different. Which ones are the more desireable ? Thanks in adavnce.