I have 3 of these rifles.. One with no Chip, one with a minor, and one with a very defined chip (had it before I bought the rifle and modified it) and all shoot the same..
The rifle with the nasty chip shoots fine and has never shown any signs of gas leakage issues or bulging. I shoot it without worry.
I thought about sending it in until I found out that'd it be the last time I saw it, and I wasn't interested in any of the offerings as replacement..