Savage made a 6BR DBM rifle ; of course it is a 4.4 SA ; the mag boxes and followers are identical (to my eyes) to the 223 except the mag box lips are spread out a bit.
If you search there are still 6BR DBM mags out there for sale but maybe not for long as I think Savage has discontinued them ? These have a silver base plate.
You should be able to do a ADL style setup by buying the box and follower from the Savage store.