Sure. It's actually simple ... BECAUSE a "short Rifle" is defined by a 20 inch barrel. BECAUSE a short rifle has a 20 inch barrel, a Carbine had to have a "shorter barrel" than a rifle. BECAUSE a "Border Rifle" has a 20 inch barrel, a Carbine had to have a shorter barrel than a rifle. BECAUSE Uberti rifles were never intended to mime REAL Winchesters. Just sort of look alike. BECAUSE Uberti rifles are Replicants, not true reproductions. Or simplify it. "JUST BECAUSE"
And, iffy you look real close, yule find ALL the manufacturers copied Uberti dimensions and made Their carbines with 19 inch barrels. Mostly. Uberti '73 Carbines, and others '92 Carbines have 19 inch barrels.