Shield Arms says it’s coming. Just got an email from them. https://shieldarms.com/glock-43x-48-15-round-mag?mc_cid=93412139af&mc_eid=463e61e3ee S15 - Glock® 43X / Glock® 48 Compatible Magazine After the folding lower, we will be launching the Standard 15 (S15) magazine. Yes it's real, and yes it's really coming. In case you missed it, the S15 is a flush-fitting 15 round magazine for the Glock® 43X and Glock® 48. The magazine is currently at tooling, and we are still on track for a summer release.