Kel-Tec KSG 12GA from Maccabi Arms LLC near Cleveland, Ohio, USA

The KSG is the shortest 14-round 12 gauge you can get — 26 inches overall with a full 18.5 inch barrel, which means no NFA paperwork and no short-barrel compromise on pattern or velocity. Two independent 7-round magazine tubes feed through a manual selector, so you can load one tube with buckshot and the other with slugs and switch between them with your thumb. Downward ejection out of the grip area makes it genuinely ambidextrous — shoot it off either shoulder.