I post these pics from time to time to educate newcomers on how they can shoot in their backyard without disturbing the neighbors. I am sure it can be scaled up or down according to your preferences.
It is made of a series of baffles made from 3/8 plywood all stuffed into a plastic 55 gallon drum. The holes in which you shoot through are made progressively smaller towards the end. Helps keep the sound in the drum. Standard insulation is stuffed in between the baffles. 1/4" rat wire keeps the insulation from falling in the area where you shoot.
The blue "add-on" drum is not needed. I just use that to keep longer barreled rifles from getting too close to the end and as a resting place, especially for handguns.
A word of caution--Its no good for blackpowder guns as the blast comes right back at your face! Maybe some smarter guys here can figure out a way to get past that. Also, velocities should be kept below the speed of sound. (1100 fps) It will still work with high velocity rounds but as the bullet passes anything, a loud crack from breaking the sound barrier is heard. Seems to me to be just as loud.
Target velocity rounds, along with 1000 fps 45-70's sound like, well, not much. Maybe a little "thump". The wife can't hear it in kitchen, 30 feet away.-----------------Sixgun
![Image](http://www.hunt101.com/data/500/5817RM_4.jpg)