The Tippmann 98 Response Trigger Kit will increase your rate of fire and also able to tune to shoot different burst modes. The response trigger works as a piston behind the trigger that actuates the trigger foward, by holding the trigger at the right spot the marker can go into automatic fire or tuned correct shoot at burst. The response trigger is truely unique as it requires no batteries to operate as it uses the exhaust gas of the marker to operate. Increase your rate of fire without the worry about your batteries dying!