I am working to set mine up just like I had my m4 in the army, and I had a three point that had a really tight set runner from the front sling mount to the stock, and the sling itself started right about where the ejection port sits on the opposite side, and wrapped to the base of the stock. Being that the rifle is polymer, would it cause issues to have the runner really tight? I'm afraid it would cause the polymer to warp over time, am I being overly cautious, or am I thinking correctly?