Assault Rifle

The Assault Rifle, sometimes referred to as a machine gun, is a firearm that appeared in Batman: Arkham Origins, Batman: Arkham Asylum, Batman: Arkham City, and Batman: Arkham Knight.

Arkham Origins Incident
The Assault Rifle appeared with most armed Thugs and as a useable weapon in Multiplayer. The skin was pure black.

Arkham Asylum Incident
The Assault Rifle was used throughout the game by friend and foe alike, and was one of the most common firearms encountered. Guards could be seen wielding it at the beginning of the game, and would use it almost exclusively with the exception of a few randomly generated Shotgun toters. Enemies that used that weapon would fire it in three-round bursts with near to dead-on accuracy, which made it a threat within the confines of the asylum's facilities. On "Hard" difficulty, it was especially deadly, and was able to take down Batman within 4 bursts. Unlike the other games, the Assault Rifle's skin was camo.

Arkham City Incident
The Assault Rifle retained its stats from Arkham Asylum, and was still the most commonly used firearm. It was seen in the hands of every faction in game, from the TYGER Guards and Commissioner Gordon's undercover cops to the henchmen of the Joker and Two-Face. The ones who wielded those weapons usually stood guard or provided cover to unarmed henchman. The skin again was pure black.

Harley Quinn's Revenge
The Assault Rifle was used by Harley Quinn's Gang after the events in Arkham City. Both Batman and Robin, faced thugs who wielded those weapons either outside the Steel Mill or within it. The stats for the weapon remained the same as the main game and the skin remained the same.

Arkham Knight Incident
The Assault Rifle was commonly seen in the hands of the Arkham Knight's Militia, and was occasionally used by generic thugs. It could cut down Batman in 3-4 bursts on the hard difficulty. The skin was again pure black.

Trivia

 * The Assault Rifle itself resembled the real life Heckler & Koch HK416. However, in Arkham Asylum, the rifle more closely resembles the Heckler & Koch G36C.