amandakay,
Harrington & Richardson Arms Co. made a few different models of single shot shotguns starting in 1900 and extending to Feb. 1986, when the HRA Co. closed it's doors. I know of every catalogued SB shotgun they made but have never heard of a Model 30R.
If you can - post a picture of the left side of the receiver showing any markings - or describe all the markings you can find stamped into the receiver and barrel, exactly as they are stamped.
Here's a couple pics - does either one look similar to your shotgun?
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