Our stock rails are made from the highest grade components. Don't be fooled by other cheap stuff out there on the net. This is the only thing holding your bi-pod or other accessory to your stock. If it rips out you are in big trouble at the worst possible time. We make our rails from 7075 T6 Aircraft grade aluminum and then we type 3 hard coat anodize them. There are other "aircraft" grades but if "7075" isn't specifically mentioned its a lesser alloy. Additionally we supply these with stainless steel pillars to bed into your stock. Aluminum pillars in a stock can and will strip out from time to time if too much force is applied. We prefer to spend the extra time and money to bring you a top grade no fuss product with no sharp edges that will last 3 lifetimes.