Vice & Protoge have the pillow bolt, that ensure a good seal with the ball, and thus quiets down some of the sound.
Marq's shot so similarly to spools, that's why they're quiet. And they have that pillow bolt again.
Angels not really too sure why. But damn do they shoot nice. IMO, take a magno'd A1 over an Ego 8 any day. And once I get my 2 magno kits, I will have.
