Robin: we discussed that barrel back in 2011, and it is not English Laminated Steel, but a very high grade Herringbone or
Manufacture Extra. Lots of examples here
http://www.picturetrail.com/sfx/album/view/23997270
Remington called a similar pattern ‘Legia P.’
BTW: several 'before & afters', and refinished barrels are here
http://www.picturetrail.com/sfx/album/view/17227428