The run-animations, I think, needs a little bouncing - gravity on the head and rifle arm.. I tried to show what I meant but I have to go out now, so Ill comeback later with that..
And Im not sure, but when I looked at the animation it seemed the foot contact(key frames) didnt have the same inbetweens (didnt have the same amount frames inbetween when the foot hit the ground)..
Like I said, I would like to give it a try later.