I bought a new Glock G19 MOS and fired 400 rounds ...

I bought a new Glock G19 MOS and fired 400 rounds of top quality factory ammo. The barrel coating wear is worse than any 9mm gun I own. Also, the recoil spring jumps out of its nest after the first round. I emailed Glock support with no answer. I called them and they said barrel wear down to the metal is normal and the spring dislocation is no issue?? Why other competitive guns with better value don't have the same issues? See pictures attached.
Otherwise the gun is reliable and no malfunctions whatsoever. It fits really nice in the hand. I can pick up the plastic sights with no trouble but I don't like the trigger.