It's never gonna be "quiet" while supersonic.
A nice solutions would be a .300 Whisper/AAC with a can. You can shoot .220 gr. bullets at 1,050 fps subsonic, pretty quiet. Now, the range won't be that much, probably 100 yds. And you'll need to hit them in the right spot.
You don't need to spend a bundle on an AR set up, a single shot H&R will work. The cost of the can and stamp will be more than the gun, but it can be used on other .30 cal. rifles with threads.
It's an excuse to get another gun...
DF
