Affix the metal bracket to the backside of the gun. The gist is to put the nail in the metal bracket so it will move forward and hit the bullet. When you’ve got it in place, screw it into the wood using the wood screws. To produce tension, affix your rubber bands between the front coupling and the notches on the metal bracket.
This basic design can work for any caliber of ammunition as long as you change the measurements to match the specific size of the bullet you’re attempting to fire.
Shoot the gun by pulling the bracket back and releasing it. Note: this is highly dangerous if it hasn’t been measured correctly. To attempt to guarantee your safety, hold the pipe with welder’s gloves or a rag and put your bullet or shell in the pipe. Aim it at an accurate target and hit the bullet square on with the firing pin.
Testing an Improvised Gun
Always, always test your gun before firing it from your hand. With some effort and planning, you can be sure your gun won’t explode when you attempt to fire it.
Create a barrier. Stand behind a large tree or stone wall and fashion a simple rope-pull to work the gun from safety. Mount pistol securely to a table, bracing it in a boot or between two heavy books, or some other sturdy support, no more than ten feet in front of the barrier.
Affix a cord to the firing strap on the pistol. Just tie an elastic band, string, or some other cord to the metal bracket to pull back and release.
Release the cord to fire. If pistol doesn’t fire, cut the elastic bands or raise their number. Fire at least five rounds from behind the barrier and then examine the pistol before you try to hand fire it.
There’s the real possibility of injury in making a homemade gun. Again, use extreme caution.