To elaborate on the last post....
Inside electronic markers there is a circuit board which controls when and how the gun shoots. The problem is, tournaments change their rules every year, resulting in the boards in the guns having to me limited at a certain #bps, as defnied by the people who run it.
Basically, if you wanted to play tournaments, you will want to get a new marker because the older angel boards are hard to get hold of and if you do it will cost a fortune.