the only carbine I have, I bought at collector's show in the early Obama years. "44 inland, push button safety (and it is indeed easy to drop the mag when pushing the safety), no bayonet lug, rear adjustable sight, round bolt, and I have never bothered to research the other re-build parts on my rifle. From what the seller told me, I think mine was an early DCM "transitional" rile, likely bought by a vet, whose son sold it to the collector when the vet passed. I think it had a new barrel installed, because when I got it and ran a patch thru the barrel, it came out without a spec of fouling. I doubt it was ever shot by the person who acquired it first from the DCM. Paid $600 for it then.
It is an easy cartridge to reload and just a fun rifle to shoot. I have an assortment of new and original mags for it.
SF VET