I've done a few upgrades to my gun (I'm a complete noob at this) and it worked fine for a couple month's then I didn't use it for awhile and now it's not working. It seems the little plunger bit that pushes out the balls or something isn't fully retracting itself which is blocking the next ball from going into the chamber. I could be completely wrong with that but that's what I think is wrong with it. I'll attach a video if I can. I'd prefer to try and fix it myself rather than taking it to a shop just because I like to do things myself to learn about them but if you think it's easier to just take it to a shop then I can do that.

Videos: https://imgur.com/a/DtyqXLN