As mentioned above, the bullet feeder is quite loud.
On the bottom half of the bowl i glued in a strip of thin rubber (i cut some old bicycle tube) with two-sided sticky tape, this helps a little against the noise of the bullets falling from the top of the bowl.
Also i cut a circle the size of the bowl out of styrofoam with angled edges, so with a little pressure it´s fitting well, also reduces the noise, and you can remove it quickly for new bullets.
Hope this helps a little!