Of course there are for carbines. The Russian have a quad stack for the 74 in 5.45x39. I have a 75 round drum in 7.62x39.
I have the drum also. The surefire is a single magazine that feeds all 60 rounds without a changeover. It is triple bunked at the bottom but singles out where the mag inserts into the AR-15.
My whole point in this is that of course I’d allow them to get rid of those dreaded ARs and AKs with their 30 round magazines IF there was a comparable capability with a semi-auto shotgun that where ‘they’ ceded “shotguns are okay”.
I was being sarcastic, IOW