Comment by rolph

if you are using 22 shorts you have a good chance of making it almost silent, it will still sound like a couple of pieces of metal smacking against each other, unless it is bolt action. the problems being supersonic rounds and the shockwave [sonic "boom"], and the sound of the action itself. the professional killer item is more along the lines of a Welrod: https://en.wikipedia.org/wiki/Welrod, or similar devices.