What year was your Remington 870 shot gun made serial number 6566du?

To determine the manufacturing year of a Remington 870 shotgun with the serial number 6566DU, you can refer to Remington's serial number lookup resources. The "DU" prefix typically indicates it was made in the early 1980s, specifically around 1981. For the most accurate information, checking with Remington or a firearms expert would be advisable.