I'm doing it right now. I have no fucking idea what you're talking about.
I was doing the same hand configuration as this guy. minus the right to hold the camera.
Seriously, you guys are fucking whiners and perfectionists. The animation quality is fine. Great, even. I see nothing about it that looks unnatural, and I see a bunch of additional touches that make them even better than the BC2 animations for the AR15 variants. The movement of the sights in LDS mode, the indication of the stock being braced against the shoulder while reloading, it just fits.
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