how far away and waht direction is the neighbor?? if they are pretty far and the total opposite way your shooting which i think is right? then noise wont be too bad at all.....they might hear a little crack.....but it wont sound like it does to you right there.....gunfire is noticible far away but its not load.....heck i doubt you can hear it in a house most times if your shooting the opposite way and arent really close to the house.....