Never again will you begin a stage, Mag in Bolt back, get into a position, and close the bolt, only to find that your chamber flag is still inserted! The Mag-Flag is a Magazine-based flag that shows that the rifle is ‘cold'. This Mag-Flag fits any AICS style magwell. Directions: Simply pull the bolt to the rear, insert the Mag-Flag and the bolt cannot move forward into battery. Control bolt movement with the included bungee - to keep it from knocking around while moving from stage to stage. Now your shooters to your left AND right will be able to see that your rifle is ‘SAFE'!