I have had my Remington 5R for almost a year now and I love it, but I have noticed the more of these rifles I see I notice they have "5R rifling" engraved on the barrel after the caliber engraving and I looked and mine does not. Do just the .308 5R's have this engraving and my .300 WM doesn't? Or is this a new detail they are putting on the barrels? Thanks for any inf!