0LargeMouthBassBest Answer 8 years ago ReplyUpvoteIt would be very straightforward to construct the circuit needed. The IR trigger would consist of an IR LED shining on an IR phototransistor. The circuit could be set up to trigger a 555 timer circuit to briefly flash some bright white LEDs on the BBs to make them glow. I think that the most challenging part of trying to make a device like that shown would be to package it all inside a small tube. That device looks like it is only a bit larger than 1" in diameter, yet it must house a battery, the IR trigger circuit, and the light to shine on the BBs, with a bore down the center for the BBs. The battery must be a coin size rechargable battery. It would be interesting to see it taken appart. If you are willing to compromise and make one with a somewhat larger diameter, you could more easily package it. Also, I wonder what kind of life the battery has. It must be a fairly small battery.