Ok... The reason we call it "Ninja mode" is because it takes years of strenuous training to get there.
So stop spilling the beans, guys.
The spiral ported deadlywinds are quieter than the Carter Woosh.
CO2 is quieter than HPA.
Low pressure is *easier* to make quiet than high pressure.
The reverse is true in conjunction with a rain cover.
NEVER EVER EVER EVER run more than 285 fps. And don't be afraid to go lower if you know your kills will be closer. I often enter the field at 245 fps, since I often engage at 20 feet or less.