IIRC the Op Wolf gun is optical, while the t2 gun is positional (joystick).
When I had my op wolf, I fixed the gun by cleaning the lens, & increasing the brightness of the monitor. I had a really difficult time trying to find a spare. Not saying it's impossible, but it wasn't a simple task.
What are the symptoms of the gun? My problem was that everything was registering in the same place onscreen. But I could shoot & launch grenades...