The extended Night Vision Bridge has additional space along the NV bridge can be utilised with what ever hight M-Loc picitinny rail is needed to meet the hight specifications of the reciver allowing the operator to customise and suit the hight’s to achieve the perfect alignment across the entire set up and still allow the barrel to free float without interference, The extended rail also has the options of the Anti fog/mirage covers that can be mounted to the top of the NV bridge which eliminates heat interference from the barrel that can impact scope vision by directing the heat away from the scope, we have also added a little bullseye bubble to help line up/level your rifle to ensure maximum accuracy while setting up your optics,