The only light-equipped shotgun I recall is the High Standard Model 10 bullpup - the A model had a fixed light over the barrel and the B had a detachable light under the barrel. They were only sold to Law Enforcement. Unfortunately it had a limited magazine capacity and fired only magnum ammo.
I've seen the Snake Charmer, but they seemed just too small to be a serious defense gun.
I've seen the Snake Charmer, but they seemed just too small to be a serious defense gun.