Toysoldier,
You got a great buy on that 28 ga. at $100, even with repairs. I don't know of any rifled versions. There are no catalogue references to commercial H&R rifles of ANY KIND until after WW2. During WW2, H&R made some of Eugene Reising's designed semi-auto (M60) and full auto .45 ACP carbines (M40, M50, M55) and some semis in .22lr (M65) for military training rifles. After the war, H&R continued production of the semis and eventually began producing bolt action and single shot break actions, as well.