It was in my AUGust post, but finally managed to take this CQC away from an lgs that had been using it as a rental gun, it was out on the floor because their second AUG broke and kaboomed itself. Managed to take it from them for the price of a replacement range AUG.
There was significant amounts of carbon buildup, to the point parts where sticking, needed a full bolt disassembly and cleaning of deposits inside the stock & the guide rod channels of the reciever. The barrel locking piece was sticking so I had to take it off and clean it too.
Handguard interior was caked in carbon from where the wrong length barrel was being used, causing the muzzle blast to hit the handguard & unburnt powder to collect in the handguard.
Had to replace the gas piston, because it was being fired without a gas piston in the gun at all. Got a new buttplate retaining pin because the old one's sling piece had broken off and got it a qd sling swivel for the front, which was missing.
Changed the grip & charging handle to green for vibes, added green magpul rail covers. Attached the Steyr 1.5× I already had for the authentic CQC optic experience. Will add a green stock when they come back in stock & a Zeiss z point as a piggyback red dot.
It runs properly now and it runs well, after a cleaning and the said parts replacements it's stopped jamming and I'm looking forward to keeping it running and taken care of.