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 reticule 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. Machined from 7075-T5 aluminum and with MIL-SPEC Type III anodized finish.