yes it would be as long as you have a 10 round magazine It is on the MD Handgun roster "The Handgun Roster is a list of handguns manufactured after January 1, 1985 that have received final approval for purchase in Maryland by the Handgun Roster Board and that are not otherwise prohibited by law.

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DB-15
DB15P300B10, *******DB15PB7, DB15PCB10, DB15PCB10M, DB15PFDE7, DB15PODG7
223 Rem, 300 BLK, 5.56 NATO" https://licensingportal.mdsp.maryland.gov/MSPBridgeClient/#/home

Saquon, yes it would be without the high capacity magazine.