Md. Code, Criminal Law § 4-301

(a) In this subtitle the following words have the meanings indicated.

(b) “Assault long gun” means any assault weapon listed under § 5–101(r)(2) of the Public Safety Article.

(c) “Assault pistol” means any of the following firearms or a copy regardless of the producer or manufacturer:

(1) AA Arms AP–9 semiautomatic pistol;

(2) Bushmaster semiautomatic pistol;

(3) Claridge HI–TEC semiautomatic pistol;

(4) D Max Industries semiautomatic pistol;

(5) Encom MK–IV, MP–9, or MP–45 semiautomatic pistol;

(6) Heckler and Koch semiautomatic SP–89 pistol;

(7) Holmes MP–83 semiautomatic pistol;

(8) Ingram MAC 10/11 semiautomatic pistol and variations including the Partisan Avenger and the SWD Cobray;

(9) Intratec TEC–9/DC–9 semiautomatic pistol in any centerfire variation;

(10) P.A.W.S. type semiautomatic pistol;

(11) Skorpion semiautomatic pistol;

(12) Spectre double action semiautomatic pistol (Sile, F.I.E., Mitchell);

(13) UZI semiautomatic pistol;

(14) Weaver Arms semiautomatic Nighthawk pistol; or

(15) Wilkinson semiautomatic “Linda” pistol.

(d) “Assault weapon” means:

(1) an assault long gun;

(2) an assault pistol; or

(3) a copycat weapon.

(e) “Binary trigger system” means a device that, when installed in or attached to a firearm, fires both when the trigger is pulled and on release of the trigger.

(f) “Bump stock” means a device that, when installed in or attached to a firearm, increases the rate of fire of the firearm by using energy from the recoil of the firearm to generate a reciprocating action that facilitates repeated activation of the trigger.

(g) “Burst trigger system” means a device that, when installed in or attached to a firearm, allows the firearm to discharge two or more shots with a single pull of the trigger by altering the trigger reset.

(h) (1) “Copycat weapon” means:

(i) a semiautomatic centerfire rifle that can accept a detachable magazine and has any two of the following:

1. a folding stock;

2. a grenade launcher or flare launcher; or

3. a flash suppressor;

(ii) a semiautomatic centerfire rifle that has a fixed magazine with the capacity to accept more than 10 rounds;

(iii) a semiautomatic centerfire rifle that has an overall length of less than 29 inches;

(iv) a semiautomatic pistol with a fixed magazine that can accept more than 10 rounds;

(v) a semiautomatic shotgun that has a folding stock; or

(vi) a shotgun with a revolving cylinder.

(2) “Copycat weapon” does not include an assault long gun or an assault pistol.

(i) “Detachable magazine” means an ammunition feeding device that can be removed readily from a firearm without requiring disassembly of the firearm action or without the use of a tool, including a bullet or cartridge.

(j) “Flash suppressor” means a device that functions, or is intended to function, to perceptibly reduce or redirect muzzle flash from the shooter’s field of vision.

(k) “Hellfire trigger” means a device that, when installed in or attached to a firearm, disengages the trigger return spring when the trigger is pulled.

(l) “Licensed firearms dealer” means a person who holds a dealer’s license under Title 5, Subtitle 1 of the Public Safety Article.

(m) (1) “Rapid fire activator” means any device, including a removable manual or power–driven activating device, constructed so that, when installed in or attached to a firearm:

(i) the rate at which the trigger is activated increases; or

(ii) the rate of fire increases.