An interesting piece of intel I picked up at SHOT was that C-MORE are considering civilian sales of their M26 Modular Accessory Shotgun System.
The pistol and underslung version would have NFA requirements (
destructive devices AOW or Short Barreled Shotgun) but the standalone “carbine” would be civilian legal without any paperwork if the barrel was extended to 18″.
The M26 is a breaching tool and not designed as an anti-personnel weapon. It was chosen by the US military over the KAC Masterkey and Remington MCS Accessory Weapon, both of which use the Remington Model 870 shotgun as a base. The M26 distributes its weight further back compared with the 870 and so it feels lighter.