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The subject matter of this article contains in-development information that was cut from the final version of an official and/or canonical source and appears in no other canonical source. It may also contain incomplete information since not all cut material is publicly known.
The OICW, also known as AR2, is a weapon cut from Half-Life 2. It can be found in the Half-Life 2 leak. It was to be used by the Conscripts (later Rebels) and the Overwatch Soldiers, to be replaced in the final game by the Overwatch Standard Issue Pulse Rifle.
In the Half-Life 2 leak, the OICW, based on the real-world XM29 OICW by Heckler & Koch, is essentially an OSIPR with a scope and a built-in grenade launcher instead of the energy ball thrower. Its recoil makes it very difficult to control past five shots in a row. However, this can somewhat be reduced by crouching.
In real life, the OICW features a grenade launcher. While not working in the leak (it is in the source code, but is disabled), it was shown working in promotional videos. It appears that its grenade function was moved to the SMG1 by the time the files were leaked, as getting close to the SMG grenades in the WC map pack map "
zoo_item" causes the message "AR2 Grenades" to appear on the screen.
Interestingly, the scope on the OICW when unzoomed is broken in-game (it shows a solid light green instead of the scope texture), while it works properly when viewed with the leak model viewer.
Screenshots featuring the OICW in Half-Life 2: Raising the Bar show an early model with a texture that made it look very damaged and used-up. This texture is still in the leak files, as seen below.
The retail MP7's grenade model is still named "ar2_grenade.mdl".
In the final version of Half-Life 2, the Rebel's reload animation for the AR2 Pulse Rifle is the same as the OICW's in the leak.
In the Half-Life 2 files, several texture files for HUD weapon icons can be found, most of which still containing the icons for almost all of the cut weapons. The OICW is among them. It is also present in the font "HalfLife2.ttf", used for all the HUD glyphs.
Conscript standing with an OICW.
Freeman helping Rebels fight Manhacks with his OICW in City 17.
Overwatch Soldier and OICW in the leak Bridge Point.