ALL current production centerfire rifle barrels are extractors now unless H&R just happens to have some older barrels still in their inventory, from time to time they find that kind of situation. It's possible that some of their less popular barrels like the 450 might still be available with ejectors, but not too likely any more.
Just a couple years ago they found a bunch of 270 and 30-06 Ultra Comp barrels, plus some mannlicher forends, all of which have been sold now.
But I wouldn't plan on getting an ejector barrel any more unless it's on a shotgun or rimfire.
Tim