Glock 21/Octane 45 issue

I mentioned this in my earlier range day post, but I wanted to address it specifically here. Today I took the Glock 21 Gen 4 and Octane 45 for their inaugural run. I pulled the trigger, it fired, cycled and then nothing. The trigger would not reset. There was no obvious malfunctions (FTE, FTF, etc.) I would then rack the slide, it ejected a live round, they I could fire one shot with the same results. I did this about for about five rounds. I then removed the can and ran five mags without issue (including the previously ejected live rounds).

I have the correct spring/piston. The barrel is aftermarket (Silencerco).

Any ideas?

EDIT: Ammo was AE 230gr FMJ