G19 isn’t going anywhere, but would like to see Shield offer a mag upgrade as they’ve done for 43x/48.
FWIW, S15 mags are only 1 week backorder, easy to get.
I suspect that a Shield-type upgrade for the G-19 might not be a simple proposition at all, because the G-19 magazine is already a true double-stack magazine. The Shield upgrade for the G-43x is simply a steel magazine with enough internal room to hold a double stack of cartridges, as opposed to the factory 43x magazine, which holds a stack that is only slightly staggered and is not much more than a single stack magazine.
If Shield, or anyone else, made a steel magazine for the G-19, G-17, etc., the internal volume would be such that you would be making a 2 1/2 or maybe even a triple stack magazine. I would expect that perfect function would be difficult to achieve.
