These shotguns are not "tactical" guns, but sporting autoloading shotguns that can do the defense job:
Remington 11/87 Upland Special 12 ga preferable (also available in 20 ga.) 23" bbl. straight stock. There may also be other Rem models available in 23" barrels. They come with three choke tubes, Full, Modified, and Improved, but any type of choke is available aftermarket, including cylinder bore.
The old 1100 Special field had a 21" barrel. I have both and they're great guns for both field and home. However, the 11-87 shoots both 2 3/4" and 3" interchangeably.
The action is so soft with field loads, that I've fired both one-handed.
I've NEVER had a failure to cycle in over 30 years of using Rem 1100s and 11/87s in the field.
Special aftermarket stocks are available.
Picher