Mannix can shoot a guy on the roof of a tall building.
Honestly, though I'm not taking away from latter day police, I think they expected gunplay to be much more a requisite for the job because they had a more free reign in stopping suspects with gun fire. Watching those old timers train actually shooting from the hip in a crouch is pretty amazing.
I get a kick out of the 'Untouchables' when in a warehouse full of gangsters, one guy makes a break then everyone is hit by a fusillade of G Man bullets.
I learned something new today. After WWI there wasn't much call for Tommy Guns in any service until the post office ordered a bunch to defend against train robberies.
"Run! It's the P-Men!"
I believe that was the perfect choice of weapon for that mission. Spraying bullets like crazy would make people in every direction take extreme caution.