Profile photo of Vep

An adapter with subsonic ammo or a squib load will be relatively quiet, as will a suppressor.

To bag a rabbit or a squirrel, instead of wasting firearms ammo and components, use an air rifle. An air rifle is more than adequate, even a cheap (but accurate) $45 Daisy 880 from Walmart. Something like a Daisy 880 is so light you can just carry it slung or attached to your pack as a second weapon if you want to.