Remington Arms Co. was offering ejectors seven years before Parker Bros. From my observations a much larger percentage of Remington Arms Co. hammerless doubles have ejectors than other American makes and most of them work. In the October 1894 Remington Arms Co. catalog that introduced the Remington Hammerless Double, ejectors were $22.50 extra. Same in the November 1895 catalog. By the April 1897 Remington Arms Co. catalog, that introduced the option of steel barrels, Remington Steel or Ordnance Steel, in place of the Damascus barrels, they dropped the price of ejectors to $5 extra as they remained through the rest of production.
During its lifetime, 1889 to 1910, Remington Arms Co. produced 134,200 Model 1889 hammer double guns in 7 grades, 41,194 Model 1894 hammerless double guns in grades A- to EEO-, and 98,508 Model 1900 hammerless double guns in grades K- to KED-, for a total of 273,902, over 30,000 more than Parker Bros. produced from 1866 to 1942. For 1906, Remington's professional shooter William Heer carried the high average on over 14,000 targets shooting a pair of Remington Hammerless Doubles, an FE-Grade and a CEO-Grade.
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In 1905, Remington introduced their John M. Browning designed Remington Autoloading Shotgun. In 1907, J.J. Blanks won the Grand American Handicap with the new JMB gun.
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The Remington Autoloading Shotgun won the GAH again in 1908 and was selling as fast as they could make them. That and the 1908 introduced John D. Pedersen Remington Repeating Shotgun spelled the end of the Remington Doubles and in February 1910, Remington Arms Co. sold their entire inventory of break-action guns to Norvell Shapleigh Hardware Co. of St Louis and went into their shotgun future with their autoloader and pump.
Being out of the market that early, Remington doubles were never offered with a single trigger, though Remington Arms Co. had collected many patents for such, were not made in gauges smaller than 16-gauge, and were never offered with the options of a beavertail forearm or a ventilated rib.
Yes, there have been a couple or three very late Model 1900s made with 20-gauge barrels, but such were never catalogued.