The factory was Remington headquarters until 1984 and the source of sporting and police ammunition headstamped REM-UMC until 1970.

The New York sporting goods firm of Schuyler, Hartley & Graham purchased two small New England cartridge manufacturers in 1866.

Leet of Springfield, Massachusetts, was moved to Bridgeport where ammunition production began as the Union Metallic Cartridge & Cap Company until the operation was incorporated as Union Metallic Cartridge Company in September 1867.

In February 1909 UMC completed a 190-foot (58 m) shot tower which was the tallest building in Connecticut for many years.

Remington merged with UMC in 1912 and Bridgeport became Remington-UMC corporate headquarters while firearms production stayed in Ilion, New York.