Originally Posted by stanley52
USUALLY a 5r barrel would be in reference to the M24/MTU diameter of barrel contours (.900+), not sendero or rem varm contour (.83 muzzle).
No, the "5R" designation for a barrel would be in reference to the number and shape of the lands in the rifling inside the barrel, that was designed by Boots Obermeyer. It has absolutely nothing to do with the barrel diameter. M24/MTU has to do with the contour of the barrel.
However, in this case, the model rifle that that particular stock came off of, is designated by Remington as their 700 5R MilSpec rifle. It is offered in .223, .308 Win, and .300 WinMag only. Used to also be offered in 6.8 SPC for a little while too, but those weren't very popular.
That barrel does have a 5R Obermeyer rifled M24 barrel on it. However, for the 5R MilSpec rifle, Remington takes the M24 blanks and recontours them down to a Sendero/Varmint contour, and leaves them matte stainless, instead of leaving them M24 contour and duracoating them black, like a true M24 is.