this is the first i have seen of this. What do you think? i think the fact that it says zero means there is still 1 in the chamber is a lawsuit waiting to happen. I like the idea on an AR- because I sometimes lose count when moving and shooting the AR with 30 rounders. It only starts showing #of rounds once it hits 12 in the AR because the magnet only covers the mag well not the whole mag.
http://www.youtube.com/watch?v=lX_I219utRQ
http://www.youtube.com/watch?v=lX_I219utRQ