Tactical Tough Flip-up scope covers from Tenebraex, are designed to protect your optics from the roughest of conditions. The rugged design closes firmly into place and provides reliable protection. These covers are designed specifically for use with the SunGuard Anti-Reflection Device, but can be used without the ARD with the Tenebraex brand specific adapters. Tenebraex TT Adapter for 56mm Nightforce 56NFCC-AR