I found this interesting (Wikipedia) . . .
The Model 30 Express version was available in several configurations - The basic 30A with its 22 inch barrel, was offered in calibers .30-06 Springfield, .25 Rem, .30 Rem, .32 Rem, .35 Rem, 7mm Mauser, .257 Roberts. On these guns, the aperture receiver sight was omitted, and replaced with a more conventional rear sight mounted on the barrel. The rifles were also available in more expensive grades; The Deluxe or "Special" 30S which in 1930 became the Model 30SL, the 30SR with Redfield Optics sight, the 30SX, with a Lyman sight, and the 30SM with Marble-Goss aperture receiver sight. These "Special" models were available with 22 or 24 inches barrel, selected stock, One variation the Model 30R Carbine was introduced in 1927 with a 20 inches barrel, and was available in .25 Rem, .30 Rem, .32 Rem, .35 Rem and 30-06 caliber. The Express 30 family and its variant were manufactured in number of approximatively 22800 units, between 1926 and 1940.
The Blue Book I have references the Redfield sight but neither the Lyman or the Marble-Goss versions of the rifle.