It's just a projectile replacer, its not going to change the world model. Basically the projectile is a separate mesh from the world model. For instance, I believe that in game the 5.56mm ammo actually uses the .308 projectile, as there is not a 5.56mm projectile model.
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If you use the normal or the scope sight the rocket uses the normal mesh(for projectile).
The ammo and projectile meshes are different.
Hope this clears the confusion, and thanks for using the mod.
Made an optional file that replaces all missiles with the mini ones.
Install just one.