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Remington 870 wingmaster 28 ga. skeet bore

Could someone help me determine DOM on Remington 870 the barrel code shows A A T the t being a bit higher than the A A I find the A A being mar, 1980 or using A T being mar. 1999 don't know which to use. It does not have Rem chokes if this helps. Any help is always appreciated. Terrill
Comments
Chokes became standard in 1987 so I would say it is the former date.
Pick 1: AT codes were used in March 1970, & March 1999.
https://www.gunvaluesboard.com/remington-barrel-date-codes-date-of-manufacture-2164.html