If you don't know the cause, it's good to that, but if you think it's the last way, you'd better ask questions from more other communities

흠 줄질?

I guess there might be some kind of 3d printed holder for dry fire use, that goes into magazine instead of BBs. Otherwise you can disassemble the magazine, remove the spring and mag follower temporarily, and reassemble the magazine for only dry fire use. you can reassemble the spring and magazine follower when in need.