I'm a Glock fanboy, and I'm buying my first red dot on a Glock 43x MOS. I pick up my gun after this weekend snd have a Holosun 507K that's finally being shipped this week. I also was finally able to order some Shield arms 15 round mags for it. I haven't gotten a time frame on those. I waited over 5 months just to be able to order them. Thanks for allowing me to be a part of this group.