Sorry. I just want to know, since I'm attempting to build a very primitive version of a gearbox. I should have asked if there was ever an animation diagram of a gearbox that shows how this particular feature works.

I already know how an AEG gearbox runs on full auto, but I'm still not quite sure how the semi-auto function works. I researched and found out that: "If semi-automatic fire has been selected, the sector gear activates an electrical cut-off as it returns to its starting position. This stops the cycle...

How did you get the bolt to have a cone-shaped front?

Hi. This is my first post here. Sorry if this sounds noobish, but where did you get all the springs? Also, where did you get the small diameter pipe? Is it possible to buy them from Home Depot in the US?