Indeed! There's also active reloading! Just start reloading, and the moment that your ammo counter changes you can initiate a Sprint/ change weapons to cancel the rest of the reloading animation.
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Almost every single fps Shooter game has this mechanic, and I always use it.
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That's less an unspoken mechanic and more an exploit of the reload animation, but good for you telling people about it anyway.
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Well regardless, it's harmless so I'd like to think it will go on unpatched.