That would be a strictly custom affair.
Hipoint firearms makes carbine in.380 cap.
marlin 35 cal. lever action. rifle/ Marlin makes the rifle ,but not the ammo for it.
the 380 is a 9mm short
Remington.
Chipmunk
No.
No.
NO
Let a gunsmith do it.
No one that I know of.
The case of the 9x18 cartrdige is 1mm longer and the slug is slightly wider. In metric .380 ACP is 9x17.
no the rifle is 85 cal and is second lowest to the pistols
Marlin model 80