The problem players are seeing is not to do with the gun, it is to do with the sort of test equipment they use.
The test equipment of choice for the last couple of years was the Pact sports timer
http://www.midwayusa.com/eproductpage.exe/showproduct?saleitemid=790260&utm_source=
You will see it is in essence a sophisticated timer that counts a noise signature (the bang!) and works out the delay between shots or the complete string tested.
There are a few others that have entered the market place that also use similar technology.
The problem is not all guns exhibit a similar noise signature and some test units count more than has been shot.
The also have difficulty counting shots from markers that have a quiet barrel noise signature, IE: the Dye DM range.
The Pact timer is undoubtedly the best available using sound technology but is not without any inherent weakness.
The only way of correctly checking how many balls per second is actually being shot is to count them (the balls themselves) not the noise the gun makes.
That can easily be achieved by using chronographs that use Doppler radar technology that counts the balls and is not effected by any noise, they are available but not widely used.
If your days paintball is dependant on your gun meeting particular guns regulations, make sure the test equipment used counts the balls leaving the gun - not any random noise around it.
http://www.paintballradar.com/
I have noticed a lot of this thread mentions Ego's I can tell you all this the PA have tested most guns out there and with a good hopper and batteries
Ego's have absolutely no problem shooting exactly as the regulations tell them to shot, just like all the rest
Russ