I tend to agree with Rangr44.
If your rifle has a 20-inch barrel, it is almost certainly an
early model "H" Carbine. This model was introduced in 1923 and discontinued at the end of 1940.
The model "H" in that era had a hand-rubbed varnish finish and, in 1928, a white metal bead was added to the front sight. The Model H's slender forearm did
not have a schnoble tip. Some models had fruitwood stocks and, unlike most Model 99s, the "H" model Carbine didn't have "flattened pads" on the butt-stock.
In the pictures you posted, they show that your rifle has that slender, non-schnoble forearm and doesn't have flatten "pads" on the butt-stock (just behind the steel receiver).
A barrel band along with heavier wood was added in 1931.
Your rifle appears to have been refinished and reblued which ruined its "collector's value", but brought out the classic rifle's beauty as point of pride of ownership.
Your rifle is a beautiful example of the "H" model Carbine and a fine, handy little rifle in a classic caliber which is slightly superior to the .30/30 Winchester cartridge... a great little "woods rifle".

Strength & Honor...
Ron T.