Glad you got it fixed. The Sport II is their economy rifle and I'm not surprised to hear of issues now and then. Even so, they have a great warranty and good service.
I look forward to hearing about many more happy rounds from yours.
EDIT to add:
That Geissele trigger is nice, but check out this one:
POF AR15/AR10 4.5lb Trigger w/ KNS Anti Rotation Pins
It's easier to install and on sale now for $135. I have one and they're amazing.