What is age of your model 10 Remington shotgun U55191?

To determine the age of your Remington Model 10 shotgun with the serial number U55191, you can refer to the Remington serial number reference charts, which indicate that the Model 10 was produced from 1908 to 1929. The "U" prefix suggests it was manufactured in the 1920s. For an exact year, you may need to consult a detailed Remington production database or a firearms expert.