How about this:
The Semi-Auto Remington 1100 Shockwave
The gun is classified as an AOW. That means you only have to buy a $5 tax stamp, and wait a little bit.
The Remington TAC-14 is a shorty shotgun that is not subject to NFA rules. It’s made in the factory without a stock, and is therefore simply a firearm, and doesn’t require a tax stamp.
The gun above from Black Aces Tactical is a semi-automatic Remington 1100 that is cut down to similar proportions.
Because it’s semi-auto, it isn’t fully exempt, but it’s still not a short-barreled shotgun (SBS), but rather an AOW (any other weapon). That means you just need to pay a $5 fee and fill out a Form 4, and wait, of course.