This bright yellow flag is called a DOS (Dust cover Open bolt indicator Safety flag) and we think lots of AR shooters will really like it. The safety flag and open bolt/empty chamber indicator looks just like the current AR safety flag (14-475) and has been approved for NRA High Power matches. The ejection port cover will keep sand and grit out of the rifle in windy, dusty or desert shooting conditions. Perfect safety flag to keep in you AR rifle case.
Sinclair, Issue:3B, Page:226