Check out this shotgun I just scored!

This is incorrect, Browning made a deal with Remington in 1906 to start production of the model 11 in 1911. they were made by Remington until 1947. Many Remington 11's were also used in WWII, about 850,000 were produced in total.

When Browning started making them they changed the release button on the side of the gun. which is why I thought this looked like a Remington.
You missed the part where the weapon described has having an FN inscription. It was an FN manufactured weapon, not a Remington model 11.