I recently purchased a Chinese Sks. And have some questions. First the Gas Cylinder hand guard is loose when latched into position. Is this a problem? The second problem is the Gas Cylinder Tube Latch lever and latch cam is loose. So, when you turn the latch lever it just rotates around the end of the cam. Anyone have a suggestion on how to repair the loose fit of the Gas Cylinder and Gas Cylinder Tube Latch?