I made a few props and all i added was the primitive itself. i added no collision primitive like in a guide said. after seeing that it had collision when i didnt add that. is adding a collision primitive a need?

When you make a prop model you do not need to add collision, collision primitives are required for vehicles (usually what I see). VisualMunge collisions do for you. If your model is a building or any space where the units are required to enter or walk on it would be advisable to add the line in a nameofyourmesh.msh.OPTION file in the same folder where your mesh is.

Hope help you.

Thanks