Range Day | Glock 43x | Shield Arms Mag Jam

Shooting my Glock 43x for the first time, using the Shield Arms 15 round mag & it jams after 2 shots.
Any reason why?

[@csyalx]

what gen? are u using the metal mag catch?

[@brapbreed]

Never used it again after this, I even ordered a metal mag catch but never installed it.