First "Glock" build. Need help troubleshooting.

[Stone]

Honestly, I consider an "initial break in" around 1000 rounds. I would strip it down, clean it up and run it "wet". Do some dry firing after that to see if you can simulate the trigger not resetting. Rack, dry fire, repeat for 50 times or so and pay close attention to the slide interfacing with the lower, something maybe hanging up and some gunsmithing may be needed. Also rack the slide all the way back slowly, let it release slowly riding it forward several times real slow, you will be able to feel if somethings hanging up. Dont rule out possible limp wristing on the failure to extract, my glock does it when I am focused on everything else but my grip. What ammo were you using? If it was just training ammo I would run a box of your SD ammo as well to get more reference points...