Basically, my model is a group of little soldiers, right? They look like this-
However, when I drag them around, because of the guns being longer than their arms, it ends up shooting upwards so the guns are at the bottom of the model, and I have to manually fix it-
Meshparts come with proper collision and can have PBR textures, while special meshes cannot.
If you use a special mesh you can resize the part separately from the mesh in properties.