[Gearsofguns.com does not suggest or recommend altering the barrel of any shotgun]
In the past few years I have had the opportunities to shoot 2 different sawed off shotguns.
A 10 gauge (legal) 18” barrel shotgun and a 20 gauge with an over 18’” barrel
The 10 gauge has been used as a slug gun (firing only 10 gauge slugs) to blow up 5 gallon buckets of water. Also for demonstration of the slugs in courses teaching about shotguns and clay pigeon shooting.
The 20 gauge we use in clay shooting but due to the modification of sawing off the barrel the shotgun no longer is threaded for a choke. without the choke it allows for the shot to spread wider and faster than with a choke causing in turn the gun be less than accurate when shooting the clay.
The 20 gauge wasn’t sawn off straight and the shot fires out of the gun leading a bit to the left and the dispersion pattern makes it a hard gun for shooting clay. A gunsmith might be able to correct all the problems by re-cutting and threading the barrel for a choke but just as a home defense shotgun it is fine.
Gears of guns does not recommend shorting shotguns or altering the weapon. Check state and local laws before altering a shotgun or any weapon. Any alterations to the mechanics or barrel of any weapon it is recommended that it should only be done by gunsmiths.
[Special thanks to DJ for sending us this]