Poly count/face count limit for FPS hands & arms?

What would be a good range? I have created some but feel they may be too high poly.

Just looking for a ballpark range.

Depends on what platform you are building for, the type of shaders you plan on using, and the amount of other things going on in the scene. I’d start around 3 - 5k if you’re going pc and increase resolution if you need it or reduce your polycount if performance suffers.