Unlike traditional scope rings which require careful attention be paid to maintaining equal gap between the upper and lower ring halves, Barrett's ZERO-GAP technology eliminates this tedious process. Simply tighten the cap on the indicated side, verify reticle alignment, tighten the remaining side, and fire away. The end result is a perfect fit between scope and mount that will withstand even the heaviest recoiling rifles. Barrett ZERO-GAP Rings are wider than typical rings at 1.2 inches. This creates a greater surface area of contact between the ring and scope main tube. The benefit is a secure grip on the optic that will hold up under heavy recoil. Along with this solid connection comes protection for your expensive scope. The broad clamping area spreads out the forces and reduces the likelihood of denting or distorting the scope tube. The rail clamping cross bolt and nut are precision machined from hardened steel alloys. The cross bolt is securely pressed into the scope ring base, and the end of the bolt is staked to retain the nut.