This could turn into a debate about what / which ? but the question was =
Which is a more quieter?
between :- Etek 2, ego 05/06, invert mini, empire axe,
without a doubt it would be the Axe , with a different barrel.
These are Spot on with the fragile paint that you get now,
anything older than a 08 usually smashes up the paint going through it unless you use a low grade paint,
Axe`s throw the ball out of the park with this alone.
as far as being the quietest out there ?
it`s the only gun I would say you could shoot indoors without alarming the neighbours,
it set the benchmark for every gun manufacturer out there !!
As for the Mini , it`s a beautiful gun as long as you upgrade it with the Axe parts. it became a fantastic gun as soon as the Axe came out because of this.