The download stops for me at 1.23 MB. So, only a few seconds of the video are viewable.
How is it that the VWEAP textures are being called? They shouldn't work at all on HUD weapons due to different UV co-ords.
You will likely find an FPSC bug that assigns the normal and spec maps for the gun to all geometry regardless of the texture assigned. So, you might have slide serrations from the 1911 on the arm model or something odd like that.
As the models are shipped, they have an FX shader assigned but no shader maps included. I did that so that they'd look better in shader mode but without the bugginess. Still, it's cool to know at least one person is experimenting with the media in this way.