9mm or .45 seems to be a viable home defense carbine, much better indexing than
a handgun for most folks, and much more reasonable noise level and flash indoors
with longer bbl.
Not sure I see the point of the .380 in this platform. .380, IMO, is just what the Europeans
call it "9mm Kurz" or "9mm Short", of value in tiny, light CCW pistols. Seems like recoil and noise
with the 9mm Para should be good with the comparatively heavy carbine and giving up even more
power for no apparent gain wouldn't seem a good trade-off.
BUT - whatever turns your crank, my only quibble is the cartridge. Word is that they are
reliable and pretty accurate.
Bill