right time to debunker the myth [no not the user]. Yes you can achieve fast rates of fire with any electro marker when they are set up right.
The set up on angels is different to most others as it counts the time between each fire of the ball. Yes the read out on the lcd display might have read that he hit 24 bps. But this does not mean that he hit a constant stream of 24 bps , it just means that at some point in his stream two balls were fired 0.0416re seconds apart from each other. Now anybody can get insane rates of fire on the A4 and get a high reading on the display, the skill comes in maintaining this speed over long streams.
We have players on our team that can hit 28/29 bps and get streams of paint coming out fo the marker at insane rates due to consistancy. And yes we do have an occasional problem with outshooting the hopper.