Meh, I don't know. How long have you had your Hi-Capa? I'm just throwing random ideas out there, but could it be your hop up rubber (is this even what happens when a rubber wears down - I'm not sure)?
When I installed a Guarder loading muzzle for TM 1911's in my ex-Socom Gear, the nozzle extended too far into the hop up chamber, thus pushing each BB out of the barrel before it could be shot out via gas propulsion. When you rack your slide by hand to chamber a BB, will a BB roll out of your barrel, similarly to your video? I just sanded mine down by hand until I could rack the slide and have a BB stay stuck in the chamber, resting just on the BBU-side of the hop up rubber nub.
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