So, I just got done at the range today. Fired 100 rounds through the G48, this time Federal 124gr ball vs the 147s I had exclusively been using previously.
50 rounds of that was with the two mags that I had malfs with previously (numbered mag #1 and #4). Five times per mag I only loaded two rounds in to see if I could duplicate the last-round issues that way.
No failures at all today.
Didn’t bother swapping the recoil spring out since I didn’t need to troubleshoot anything, but I have it if I need it.