Think about your car. It is called a “Low fuel” indicator, not a “No fuel” indicator. Basically your AR-15 locks the bolt when it has run out of fuel. The Time to Change Follower is actually your “Low Ammo” indicator, which lets you go over to your reserve tank while reloading. Just by hitting the bolt release, you will load that one round to keep you safe while you get your rifle refueled by finding a new magazine. It takes about 0,19 seconds for your reaction hand to reach the Bolt release. It takes 2-4 seconds to do a full standard reload procedure with no #%&-Ups. In that time you are unnecessarily vulnerable, while with the TTC-FOLLOWER or TTC-MAG you will be locked and loaded ready to send that round flying within a split second.