| Ammo Type | Action Point (AP) | Damage | Range | Weight | Min Strength | Mag Capacity | Rounds in Burst Fire | Notes |
| 5.56 mm |
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.[8] Chambered for 5.56mm ammunition, the R91 full-auto urban assault rifle is common throughout the Capital Wasteland.[8]