Maryland Code, Natural Resources § 10-602

(c)(1) A person may not shoot a wild waterfowl resting on land or water.

(2) A person who wounds and cripples a wild waterfowl may shoot the waterfowl.

(e)(1) The only firearm that a person may use to hunt wild waterfowl is a shotgun fired from the shoulder.

(2) A shotgun used to hunt wild waterfowl may not be larger than a 10 gauge or loaded with shot not approved by the United States Fish and Wildlife Service.

(3) While hunting or attempting to hunt wild waterfowl, a person may not possess shotgun shells that are loaded with shot not approved by the United States Fish and Wildlife Service.

(f)(1) Subject to federal rule or regulation, the prohibition of this subsection does not apply to an automatic loading or hand-operated repeating shotgun with a magazine that is cut off or that is plugged with a one-piece filler incapable of removal through the loading end that reduces the capacity of the gun to hold no more than three shells at any one time in the magazine and chamber combined.

(2) A person may not hunt a wild waterfowl with an automatic loading or hand-operated repeating shotgun capable of holding more than three shells.

(3) A person may not possess a rifle or pistol while hunting wild waterfowl.

(g)(1) A person may hunt wild waterfowl with any bow and arrow.

(2) A person may not hunt wild waterfowl with a crossbow.

(h)(1) A person may hunt wild waterfowl with the aid of a dog or with an artificial decoy.

(2) A person may not hunt wild waterfowl using a live decoy.