yes it would be legal in MD UPC 8894020000025
The Factory New AR12 is a Semi-Auto, Gas-Operated Shotgun patterned after the AR15 style, Black Synthetic Stock and Forearm, fixed pistol grip and stock, removable magazine (2 x 5 Rd. Magazines) equipped with full, Modified and Cylinder Bore Choke Tubes and Wrench, Adjustable Rear Sight, Manual, Individually Boxed
*accepts mka-1919 extended magazines
*************************** MD RESTRICTIONS ARE The following are prohibited:
Shotguns with a capacity over 10 rounds.
Semi-automatic shotgun that has a folding stock (Not including telescoping [collapsible] stock)
Any shotgun with a revolving cylinder. budsgunshop.com/catalog/feeds/state_reg/maryland_restrictions.pdf

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Hi David, Yes it is legal in Maryland. Details: budsgunshop.com/catalog/feeds/state_reg/maryland_restrictions.pdf

This is legal in Maryland David. Details are here : budsgunshop.com/catalog/feeds/state_reg/maryland_restrictions.pdf