Shotguns only real advantage is that they are cheap. And with "quality" shotguns going up and AR's prices falling that gap is small today. A quality semi shotgun is going to set you back more than most AR's.
Ammo prices. 25 rounds of buckshot is a lot more expensive than 223 ammo
Recoil. A 12 or even 20 ga with loads suitable for personal protection equal or exceed 300 win mag recoil. A 223 has about 1/2 the recoil of a 30-30. Most of us would skoff at the idea of a novice hunter starting with a 300 WM, but I've seen countless guys advise a novice shooter to buy a shotgun for personal protection.
Other than price the shotguns only other advantage is a wide pattern making hits on moving targets easier. At typical HD ranges a shotguns pattern is too small to be any advantage. You have to aim carefully with either. I'd argue the shotgun is best used outdoors at moderate ranges with multiple attackers. It is known as a "Riot Gun" or "Trench Sweeper" for good reason. Those qualities don't make it a good home defense weapon.
Over penetration. Shotguns are more dangerous to folks in the next room.
Weapon size. A 16" barreled AR with a telescoping stock is far smaller and lighter.
A lot of special forces USED to use 9mm sub guns. They are falling from favor with the advent of short barreled suppressed AR's.
Of course I also agree with Kraigwy. A handgun is the first line of defense. Even with its disadvantages the fact that it is on you makes it paramount. If you have time the long gun is secondary.
Ammo prices. 25 rounds of buckshot is a lot more expensive than 223 ammo
Recoil. A 12 or even 20 ga with loads suitable for personal protection equal or exceed 300 win mag recoil. A 223 has about 1/2 the recoil of a 30-30. Most of us would skoff at the idea of a novice hunter starting with a 300 WM, but I've seen countless guys advise a novice shooter to buy a shotgun for personal protection.
Other than price the shotguns only other advantage is a wide pattern making hits on moving targets easier. At typical HD ranges a shotguns pattern is too small to be any advantage. You have to aim carefully with either. I'd argue the shotgun is best used outdoors at moderate ranges with multiple attackers. It is known as a "Riot Gun" or "Trench Sweeper" for good reason. Those qualities don't make it a good home defense weapon.
Over penetration. Shotguns are more dangerous to folks in the next room.
Weapon size. A 16" barreled AR with a telescoping stock is far smaller and lighter.
A lot of special forces use 9mm sub machine the Heckler & Koch MP5 being a favourite.
A lot of special forces USED to use 9mm sub guns. They are falling from favor with the advent of short barreled suppressed AR's.
Of course I also agree with Kraigwy. A handgun is the first line of defense. Even with its disadvantages the fact that it is on you makes it paramount. If you have time the long gun is secondary.