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It is not a heavy barrel it is a modified M4 profile "The barrel's profile is slightly altered from that of a standard M4 in that it is missing the rear cut." Full review here https://www.americanrifleman.org/content/sig-sauer-m400-rifle/
Harold, no Sir - due to the Barrel Cut Out profile. In MD AR barrels must be heavy profile and no cut outs. Details under Rifles here : https://www.budsgunshop.com/feeds/state_reg/maryland_restrictions.pdf
I would check with your Local FFL holder to be 100% sure
Harold, no it is not MD legal. It's on the banned list here >>>> https://tacticalgear.com/experts/maryland-assault-weapons-ban
