i played with Brass Eagle factory team when the Rainmaker was introduced. we were recruited by Nathan Greenman from the original Nobodys. we converted our 4 AA battery Rainmakers to 9 volt power in a hotel room at the NPPL Chicago Open (no regulator) and i dont remember having board issues. i dont remember having anything but semi but its been a long time , so its possible we had the "not yet released" updated select fire board. i never used anything but semi, soooo.... the only problem i ever had with the gun was the bolt pin breaking and the bolt being damaged by the bolt pin. otherwise, it was a good shooting gun and always very consistent with tourny paint. we also had some venturi bolts manufactured and it made shooting the gun bearable ..lol.