To qualify on that - a semi-auto shotgun.
I once stayed with a Jenvey in Dallas; both he & his wife were realtors, so needed to do some work away from their house every now & then.
So, I go the instructions & guided tour of the firearms - if anyone enters the property / grounds, you are perfectly entitled to shoot first, no need to challenge!
Study, very nice S&W revolver. Kitchen, 9mm hand gun, can’t remember the make. Lounge, another 9mm hand gun. By the BBQ (next to the pool), semi-auto shotgun. Another room, a hunting rifle! All were loaded, but not “ready.” No kids in the house.
So, I said, that’s the one - the shotgun. They hadn’t thought about accuracy, ability to get someone with the first round, or considered firing a round from the hunting rifle, missing, & the bullet going through the wooden exterior wall…
Did some dry drills with them later on - lots of fumbling & waving around initially.
And it’s short barrelled = small angle of error with sight picture = large error on the tgt. The Browning Hi-Power 9mm service pistol didn’t have very good “standard” sights. However, you could get much better issue ones (white dot on the foresight, larger gap in the rear sight, white dot either side), which were much better for instinctive aim. On the occasions that I was live-armed (RAFG), I knew that it was my Browning & I knew it was zeroed! Same for my SLR & then later on, L85 with SUSAT.