At least u got to practice failures.

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Trust me when I say it was the ammo. I see it on the regular with many different firearms with that specific ammo especially on a fresh spring I've even seen it ON VP9 and other name brands forget about it even chambering on some 1911. seen it even with some 223 AR's. The gun is stiff right now being new coupled with that ammo. I will meet you at xring if you would like and assist you and wife to get that GLOCK° running with PERFECTION. Shucks I'll buy the box of ammo even. Let me know I'm good for it. Ask around

Was the same ammo used with the M&P (without issue)? You could try taking the M&P with next range session.

At a recent handgun class, a number of shooters were having failure to fires with a specific bunch of ammo with suspected hard primers. Same ammo malfunctioned with a bunch of guns and different makes (Glock and Sig). Also some more stock and others more mods.

A shooting friend loves to tinker. He was getting tons of failures to fire and we narrowed down to that he had recently swapped springs. Back to stock springs and no problem. He was shooting his own reloads though, but that worked fine in my stock 34. [revised after seeing response about mods]

Glock perfection....