Very interesting list below. It contradicts your date.
https://en.wikipedia.org/wiki/List_of_oldest_companies_in_the_United_States
Remington Arms are held by a holding company and they are building the Bushmaster ar15s. They left Ilyon NY after over a 100 years of being there. Bushmaster was acquired by Remington Arms and moved from NY. The employees of Bushmaster bought the old plant and produce a nice AR15 under the Windham trade mark. IMHO the holding company that owns Remington Arms have ran them into the ground the same way Colts’ a$$hole management did that company.