In many cases, the M1 Carbine was very much to be a direct replacement for the pistol.
Many individuals who, lacking the carbine would have been issued a handgun, were not. They were issued the carbine instead -- troops such as truck drivers, couriers, supply personnel, etc.
Supposedly S&W produced several N frames chambered in .30 carbine.
Not only was blast horrendous, the guns apparently showed extremely accelerated wear.
"The gift which I am sending you is called a dog, and is in fact the most precious and valuable possession of mankind" -Theodorus Gaza
Baby Jesus cries when the fat redneck doesn't have military-grade firepower.