Pleased with this rail - Area 419 Henry Action 1913 Improved Scope Rail

As for adding a rail to a Henry rifle, this is the best option I've been able to find. It's great quality and the center is depressed the length of the rail to allow for the use of the iron sights. The reason for four stars is that the depression is just wide enough to be able to see both front and rear sights. Just barely. So it slows down sight acquisition. I could have been a little wider, but I suppose they had to balance with strength.