(VIDEO)The belt-fed 12 gauge you need to see in actionYouTube
What you are about to see is a prototype of the belt-fed 12 gauge upper receiver in action.
This gun uses your lower receiver, so if you have an AR15, its a semi auto shotgun. However, if you have a registered m16 lower or a drop in auto sear it becomes a full auto 12 gauge machine gun.
Either way, this thing is incredible and shoots at an amazing speed. Check it out: