you can bring any rifle you want, as long as you owned it before oct 1 2013. if its on md's banned assault rifle list, or is semi auto and less than 29" oal, or has 2 evil features, it canot be brought into the state if it was purchased after oct 1 2013. hbar ar-15s are exempt.
link to msp's non exhaustive list of banned rifles
http://www.mdsp.org/Organization/Pages/SupportServicesBureau/LicensingDivision/Firearms/FirearmSearch.aspx
moving into the state you must register all your handguns and "assault rifles" with the maryland state police. you can do it electronically via their website.
new resident registration, you have 90 days after you move:
http://www.mdsp.org/Organization/Pages/SupportServicesBureau/LicensingDivision/Registration/NewResident.aspx
md also has a list of assault pistols dating back to 1994. tec 9's and semi auto macs ect. they cannot be brought into the state, even if owned before the ban date.
i would suggest looking at a home in southeast pa or delaware. you'll have about a 45 minute commute.
www.mdshooters.com has people that can answer any other questions you may have.
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