The barrel is also arrived today. After testing, the function and performance are all good without problem.
Here to provide the pictures and testing video for your reference.
I will hand it to my technician to replace to the Zparts outer barrel. When it is done, I will let you know.

지파츠 바렐도 나한테 왔음
총 테스트 해봤는데 문제읎음 (아래 영상)
지파츠 바렐 교체 하러 다른 기술자한테 보낼거임 완료되면 연락함 ㅅㄱ