Hown to build a shotgun?
It is legal to build a shotgun, just make sure you know your
states law, in most cases you must put your own serial number on it
and document and store that serial number in case it is lost or
stolen you can notify the police that it is not in your possession
and you wont be blamed for any crimes that may be or not be
commited with a lost or stolen firearm. Most importantly make sure
you design and build it so that the shells do not burst backwards
or you could get seriously hurt.