The OSIPR (Overwatch Standard Issue Pulse Rifle), or AR2, is the standard Combine Overwatch tactical assault rifle, functioning as a Combine analogue to most human assault weapons. A large, heavy weapon with an in-built mechanical loading system, the AR2 is a deadly energy-based automatic firearm adept at taking down humanoid targets.
- 30-round "plug" magazine of pulse ammunition
- Fires Dark Energy pulses, dealing significant damage to targets and cauterizing the wound, often causing nerve damage as well
- Large, heavy frame, built for OTA units.
- In-built underslung Pulse Ball launcher, firing Pulse Balls (energy spheres that bounce off surfaces and vaporize any organic matter they touch)
- Accurate automatic fire, enabling wielder to hit targets beyond the range of pistols and SMGs