I might have missed it, but I don't think there's an attempt to register already owned long guns. If there is, good luck with that. I can't remember how many FTF long gun transfers that I've been involved with for which there's no papertrail (although one had no reason to believe that the recipient shouldn't be allowed to own a MD legal long gun).
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Only if you are an existing resident. Any new purchases must be registered. If you move in to the state you must register EVERYTHING. Make and model, Serial numbers, decription, your name and address, driver’s license number or SONDEX, height, weight, sex, hair color, eye color and social security number.