I have a 44 mag barrel, with H&R’s weaver-style rail attached. On top is a short shotgun scope that does not interfere with the rear sight. When I take off the scope and rings, I can easily see the rear sight notch over the top of the rail on MY rifle. From the posts, it sounds like this may not be true of all H&R’s. Before the last 2 deer seasons I have sighted in the iron sights as well as my scope just in case of scope damage, and for me the iron sights work well for targets. I have a harder time with them in the woods, dim light, etc.
Duane