In the first 1902 Remington Arms Co. catalog they listed straight grip CEO-, DEO- and EEO-Grade 12-gauges as Pigeon Guns, except they list CE-, DE- and EE-grades.
Pigeon Gun, 1902 Remington Arms Co. catalog.jpg
By the second 1902 Remington Arms Co. catalog they cleaned up the listing --
1902 Pigeon Gun 2nd 1902 catalog.jpeg
By the 1903-04 Remington Arms Co. catalog the same guns are Trap Guns --
Trap Gun, 1903-04 Remington Arms Co. catalog.jpg
Same in the 1904-05 catalog. By the 1905-06 catalog the we have that listing --
1905-06 Trap Gun page 11.jpg
and the new lower priced gun --
1905-06 Trap Gun page 19.jpg
For 1906 Remington was on a Trap Gun roll with their man William Heer posting the high average for the year --
The Gun Behind the Man, The American Field, Mar. 2, 1907.jpg
Also in 1905 Remington Arms Co. introduced another Trap Gun --
1905 Trap Gun.jpeg
which will win the GAH in both 1907 and 1908.