Tokyo Marui has come out with a new tracer gadget to replace the old one that seems to be always out of stock. You can buy one now at Redwolf Airsoft... "The new Full Auto Tracer from Tokyo Marui, with the illumination function improved, and easy to install just by screwing it. 4xAAA batteries are required. 100 illumination BBs are included, and remember to get the BBs also! Visit the Tokyo Marui website to get more infomartion and insturctions about it!