I thought it was because they release information on blasters without hasbros consent and find ways to get things before they should (ie vortex series).
Anyways the one sounds like it has a slow rof. Unless he just fired slowly on purposed it seemed like the flywheels needed to rev back up after each shot.
I was thinking that the blaster had an entire assembly that moves back then forward after each shot to push the discs into the flywheels, kind of like the barricade. That would explain the low rate of fire.