|For an overview of assault rifle models, see assault rifle.|
|The following is based on Fallout Shelter or Fallout Shelter Online and some details might contradict canon.|
Manufactured by civilian defense contractor Stent Security Solutions, the R Series of combat assault rifles was used reliably following the discontinuation of the M series in the early 21st century. Chambered for 5.56mm ammunition, the R91 full-auto urban assault rifle is common throughout the Capital Wasteland.
The weapon was used by troops on the Anchorage front and served as the National Guard's standard issue rifle during urban pacification operations, who were fully deployed in Washington D.C. at the time of the Great War. As a result, despite the war having taken place two centuries ago, the R91 can be found commonly throughout the ruins of D.C., currently utilized by slavers and raiders as well as sold by legitimate traders and arms dealers. Like any firearm, the R91's effectiveness and accuracy will suffer without regular maintenance.
The hardened assault rifle is an improved fully-automatic magazine loading rifle featured in Fallout Shelter. Dealing a minimum of 8 damage per attack, it has the third highest damage output for a rifle in the game.
|Rusty assault rifle||8||100||rare|
|Enhanced assault rifle||8-10||100||rare|
|Hardened assault rifle||8-11||100||rare|
|Armor piercing assault rifle||8-12||100||rare|
- Found by dwellers exploring the wasteland.
- Found on quests.
- Found in lunchboxes.
- Craftable in a weapon workshop.
Toy car (3)
Alarm clock (2)
Hardened assault rifle (1)
- Citadel terminal entries; Weapon information research database terminal, R91 5.56mm Assault Rifle
- Appearances in Operation Anchorage, and Mothership Zeta