Mossberg's SSi-One isn't just a rifle, it's also a shotgun.
"SSi" stands for "single shot interchangeable."
The SSi-One's barrels include several caliber options and a 12 gauge slug barrel. The rifle/shotgun has a lever-opening,
break-action design, is drilled and tapped for scopes and has a fluted, cut-checkered black walnut stock.
The SSi-One Sporter is available in .223 Rem., .243 Win., .270 Win., .308 Rem. And .30-'06 Sprg.
The SSi-One Varmint has a bull barrel and is chambered for. .22-250 Rem.
The third SSi-One has a 12 gauge bull barrel.