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Are you trying to use it in Sandbox?
The G2 is only for use in TTT
and does not require you to press R to reload.
Yes, the reload animation does play twice, not sure why, but I think it's part of the animations for the model itself. You have to press R to reload, otherwise it just plays the animation and does nothing.
But, I've played with it on a different server and apparently, the reload works.
Not sure about it, but for the video, I used my own files without installing the addon.
The .gma file is downloaded to your garrysmod\addons folder.
Just go to your Steam Library, right click Garry's Mod, click Local Files, and view local content or something then go to the addons folder in there.