This is the old ak model. The red line is it's center gravity, the yellow dots are where the joints are. As you can see, they're spread evenly-ish on either side of the line. It's also worth noting that the upper leg is at a different angle to yours.
This is your model from the same angle. Once again, the red line is the center of gravity and the yellow dots are the joints, and this time they are not evenly spread, making it look like it should tip forwards and that the legs are too far back. The blue dot simply highlights a line that I felt you might want to move down a bit (to follow the shape of the old ak's head a bit better). The upper leg is also at a completely different angle.
I can understand that it's hard to model the ak... I tried (twice), it can be difficult working out how to attach the legs to the body (which doesn't happen in the original model, the legs are floating in space)