[no subject]

IIRC, box magazines were also made available for it--ten rounds, I
think.

In one of the more perverse weapon hybrids I recall seeing, I once saw a
picture of a KAC Masterkey mounted underneath an Atchisson Assault Gun.
Struck me as gratuitously perverse--mounting a 12-gauge underbarrel to a
12-gauge.

Still, maybe the idea was to have a Masterkey loaded up with appropriate
rounds for door breaching, and the drum loaded up with appropriate
rounds for room-clearing.  Or somesuch.