Crossbows don't go "BANG" (I didn't ell you that)
If you can get close enough
LOL
You can do it mafia style with a snubnose and rolled up newspaper
There's a contraption out there called an oil filter silencer..........pretty friggin sweet is what it is.
Noise isn't the issue, we have a shooting range out back but the problem is that it is probably a momma, which means Cubs hanging around