I was looking threw some of the cod modeling using 3Ds Max, and it looked quite simliar to the way you build stuff in graydient. So I searched around ebay and found a copy of 3Ds Max 5. It arrived yesterday and have began to start a model. Im trying to make a custom hand grenade, but am unsure of something. How do I know if I am making it the correct scale?

Graydiant and Radiant come with example models. Open them too, so you can see if the scale is correct. And if you're making models, you can always scale them ingame with the "scale" key.