Some years ago (1985??) an officer in the RAF Regt was castigated for suggesting that a shot gun might be an appropriate gate guard wpn.
I feel we could well reconsider the proposal. A semi-auto shotgun, loaded with birdshot in the first cartridge, buckshot in the second, and solid shot thereafter.
First shot will stop an intruder, second will kill, third & subsequent will deal with vehicles. Mistakes will travel no more than 30 yds.
Anyone out there who has the auth to make it so?