From the picture it looks like plenty of room to shoot to me. Noise is the issue. Neighbors that don't like guns whine about the noise.
I have a good air pellet rifle, it's a blast but it ain't the same. Good practice and all but not the same.
A co worker got a 22 silencer and I've used it on my Charger and a 22/45, real nice and quiet. I was gonna be added onto his trust but never got around to doing all the paperwork. I borrow it from time to time to play with.

Not so much these days since he's still working and I'm retarded.