I have read about a couple of people encountering similar issues with this rifle in 12 gauge. Although, most people seem to be very pleased with theirs. I'm relatively new to shotguns. This being only the second one I have owned. Any info would be greatly appreciated.
I love my 20 ga Mossberg shotgun. I have yet to try a 20 ga rifle. Apparently they don't work so good.
All jokes aside I would just send it back to H&R. You wouldn't expect them to ship a gun with a broken shell stop. If you call they should send a prepaid label to ship the shotgun to a repair center. If you threw the box away ask for a box when you inquire about a shipping label.