Only plain barrels were offered for the Remington Autoloading Shotgun in the 1905-06, both 1906 and the 1907 Remington Arms Co. catalogs. In the 1908 Remington Arms Co. the option of a solid rib for a list price of $7 extra was introduced. In the 1910 catalog the price of the solid rib was dropped to a list price of $6.75 and a ventilated rib was introduced for a list price of $13 extra.
1910 Remington Autoloading Gun Ribs.jpeg
I have never seen a vent rib with the wide spacing of the rib supports shown in the 1910 catalog.
By the 1911-1912 Remington Arms - Union Metallic Cartridge Co. catalog in which they began calling this John M. Browning designed gun the Model No. 11, the rib supports are shown much closer together.
1911 - 1912 Ribbed Barrels.jpeg
That is how they remained for the rest of production. Here in the 1923 Remington Arms Co., Inc, catalog.
1923 Ribs for Model 11.jpeg