This is virtually identical to my "go-to" weapon if I hear someone downstairs.
Mossberg 500 pump 12 guage
Knoxx recoil-compensating folding stock
Red-dot sight
10-round "riot-gun" magazine tube and shortened barrel (min legal size)
Very short (compared to my other long arms) and easy to maneuver in tight spaces
loaded with #2 goose loads and 00 Buck, every 3rd round is buckshot
no slugs as drywall penetration is a concern, if 10 rounds of what's it's loaded with doesn't do the job, the S&W 5906 is right above it on the shelf loaded with 16 rounds of hollowpoint Black Talons, and 3 spare magazines.
I like having all 4 bedrooms upstairs... if someone does come in without authorization and poses a threat, there's only one way upstairs, up a central stair-well... a very nice narrow field of fire. Thankfully South Carolina law will back me up on this, they WILL NOT leave the house alive.