You must call Remington to get an accurate answer.
Standard factory 222 Remington ADL has a 1/14 twist rate.
Ghost Adventures - 2008 Remington Arms Munitions Factory 3-5 was released on: USA: 27 November 2009
Impossible to tell unless you have the factory records.
Remington does not do factory letters.The Remington Society of America maybe able to help you at least date your firearm but most early records were lost in a fire and only some of the early percussion information was able to be pulled from military records and other very early firearms only can be dated by model and variation. (estimate)
NO. But both these barrels are easy to remove and replace and there is a wide selection of factory or aftermarket replacement choices available for both guns.
The barrel date code is the primary method of dating a Remington. Of course, if the barrel is not the original barrel for the gun that complicates things. The Remington factory could probably date it by serial number. sales@countrygunsmith.net
Model 870 Magnum 1982 ducks unlimited edition
Barrels for a Remington 870 pump are running $80 and up around here. Depends on what you are looking for.
You won't get you answer by serial no unless you call the factory. However you will from the barrel codes listed on the Remington Society of America here: http://remingtonsociety.com/rsa/questions/barrelcodes
5K all day long in 100% condition with factory case
Markings typically include model, The Remington trademark, date of manufacture, test marks, inspectors, and proof mark. In some cases it may be a factory repair mark, or indication of Magnaflux testing. See the link below for an illustration of barrel code markings. Note these are for REMINGTON only.