Daisy Air Rifles: Keeping Kids Off Your Lawn Since 1886!
I bought a 22 cal Sheridan pump air rifle in about 1970 and my son and I were in the back yard shooting a target pinned to the fence. After a while a while my Red Neck neighbor yells from the other side of the fence that we were putting holes in his siding and that we should be shooting toward the "other" neighbor. That "Bee Bee" gun was shooting through a piece of 1/2 inch plywood and one inch fence boards...
He could try some of the Colibri subsonic .22s
no powder just the primer. very quiet.
I used to shoot down the hall in my trailor and the
neighbors never heard a thing.