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Is this what you wanted?I am almost positive I know your issue. First, can you remove the slide, and remove the barrel from the slide. Then, post a pic of the piece that is screwed into the slide, that the gas vents into during firing. If s what I think it is, i will be able to tell from that.

Here's some pictures of the nozzleTake a photo of the underside of the nozzle, is the loading nub in place?


Cough Cough I told you so cough cough.Got the WE USA Hop unit and barrell todays and ta da it works! Getting 315fps and the BBs dont fall out anymore. I think the issue was with the old hop rubber, it had lost its shape after I took it all apart to clean.
Note to self never take the hop unit apart lol