Safety Harbor Firearms is known for making a variety of short barrel shotguns, 50 BMG uppers plus other guns and accessories that some might consider out of the mainstream. The company recently posted images and a video of a short barrel Armagon G12 shotgun they’ve been working on.
If you are not familiar with the G12, it is a detachable magazine fed shotgun built in the style of the AR platform. Although the upper and lower separate in a manner similar to an AR, the G12 parts are not compatible with those rifles. According to the company, the only AR compatible parts are the pistol grip and the butt stock. These guns will cycle and fire both 2 3/4″ and 3″ 12 gauge shells.
— SafetyHarborFirearms (@SHFWalt) March 4, 2016
Semi-automatic shotguns can sometimes be troublesome to make reliable with light loads. In the above video, it fires several rounds of Remington birdshot. While three rounds does not guarantee reliability, it does suggest that a short barrel version of this gun could be reliable. If Safety Harbor Firearms decides to make these guns part of their catalog, I would be interested to see them do further testing with a broad range of loads.