Loading magazines yesterday morning showed pretty quickly that the TulAmmo wasn't going to function any better in the ETS mags than the Wolf did, and it felt kinda sticky in the Magpul mag, too, so I didn't even try it, opting to load a hundred rounds into factory Glock 19 magazines.
Obviously I did not try to fire it again.
Up to you whether you want to count that against the gun or the ammo, but I know where my vote would go.
That makes 1,366 rounds through the Gen4 19 since it was cleaned or lubricated with two failures-to-fire (#205, #1,290) and two failures-to-feed (#814, #864*). 634 rounds to go.