Well all gbb and aegs are will break, just depends on the usage and such... gbbr has more wear and tear, as expected.. and WE is low on the QC end, so it's expected.
Try the OB KIT, if it fails and your gun messes up again, it's either a) you installed stuff incorrectly B) you're doing it wrong, c) sell it.
I converted Cav from his WE 416 & M4 CQBR to a GHK M4, and his WE PMC and 74UN to a GHK 74UN.
I've known several people who have had issues on the WE platform, and people who haven't, seems it's a hit or miss, but that's just based on what I've seen.

My WE 416's and SCARS never had issues, only issues I ever had were on the bolt lock with them.. oh and the MSK I had was cancer, so... I won't go near them again, oh and their performance during winter time, but whatever.
anyways rant over, good luck mate.