why not a pistol caliber carbine like the beretta storm in 45ACP?
To be polite.....
Because pistol cartridges suck at killing things. Putting them in a rifle doesn't improve things, and in fact hurts as the bullets arent desinged for the extra velocity.
223 and 300BO with supers is a FAR better choice for use against living things.
To be blunt.....
Pistol caliber carbines are freaking stupid. Nothing like getting all the downsides of a carbine with none of the upsides.
