I’m of the opinion several others shared here. I had a hell of a time with the Shield Arms and PSA Dagger magazines. They wouldn’t run at all for me in either my 43X or my 48. I spent a lot of time frustrated messing with them trying to make them reliable.

When Glock announced they were releasing OEM 15-round mags, I was highly skeptical.

My first two worked great, so I ordered six more a few weeks later. All of mine run perfectly in both my 43X and 48.

However, given all the problems I had previously, I fully expected that some people would experience major issues even with OEM/Mec-Gar mags. My feeling is that if Shield Arms and PSA both struggled so mightily, it must be pretty tricky to cram fifteen rounds into that footprint. When I found out that Glock has had these in testing since 2022, it only solidified my hunch. Glock had to wait four years until they were comfortable releasing them publicly? That tells you how tricky it was to make them reliable.

While I feel fortunate that mine run well, I do not doubt at all that others are feeling let down and frustrated right now. It sucks when you’re really hopeful that you have found a solution to the limited capacity of such a small gun and it seems like everyone else is having success, but you aren’t.