Vortex Optics Killflash Anti-Reflection Devices Reduce objective lens glare and reflection on any threaded strikefire red dot scope with this compact, anti-reflection device (ard) In addition to reducing reflection, the threaded ard protects the len from scratches and damage To add or remove the ard: 1. Remove the flip cap from the strikefire. 2. Thread the ard into/out of objective lens barrel. 3. Push the flip cap back on