FWIW, the first .44 mag autoloading rifles were (as posted) tubular magazine "Deerstalkers", but the moniker was dropped after Ithaca brought suit, and changed to simply ".44 Auto Carbine" until discontinuance in 1985.
The very earliest Deerstalker's (ca.1961) had built-in receiver peep sights (as in: the side of the receiver was dovetailed for the sight slide).
In the mid-late 60's two additional models were made: the full-stocked (mannlicher) International (RSI), and a half-stocked Sporter with a finger-grooved forend. (some VERY few of both were factory checkered, as designated by an "X" in their model number)
In 1999, Ruger introduced a new detachable rotary magazine .44 Mag autoloading carbine version of their popular .223 Mini-14, called the Model 99/44 Deerfield Carbine, which also was dicontinued around 2006 (IIRC).
This is the .44 Carbine with the plastic handguard atop the bbl rear, to protect the shooter's hand from the operating rod. (The older Carbine's operating rod was inside the forend)
Due to the gas-operating system on both models, do not shoot lead boolits through them, unless you're a masochist who likes to completely take apart the gas cylinder for serious de-leading (or don't mind the .44 becoming a single-shot rifle).
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