This is the Honeycomb Kill Flash for the R4F Red Dot Sight Cover. It slips into the front slot:
Get the ultimate sight protection with our stainless steel kill flash / scope cover. The Airsoft3D stainless steel honeycomb is exceptionally strong and will stop airsoft BB's and paintballs from impacting your red dot sight directly. The large opening in the honeycomb design provides excellent compromise between aesthetics and visibility for fast target acquisition. The stainless steel material is virtually indestructible. You'll never have to replace this kill flash due to dents, wear, and tear.
Note that this protective kill flash reduces the chances of your red dot sight being destroyed. But it may not protect the sight completely from shattered BB's, projectiles of smaller sizes, shock, and other hazards.
Airsoft equipment used for the illustration of this kill flash are not included.