Does Steinhardt's Cannon have +X or other generic Magical variants?

So I've been looking into the Steinhardt's weapons, and noticed theres no supported generic magic weapon versions of the Cannon, despite being considered a normal Martial Ranged weapon.   Is it just missing from DBB, or is that is a specific design intention with the rules?  

I ask because theres an edge case with Battle Ready where the Cannon itself is not considered Heavy, and Artillery states you must use STR 'instead of Dex" for modifiers.  So a low Str Battlesmith can theoretically operate it as a normal weapon, if its a magical weapon.  And in the train of thought, if its not inherently magical, can the Magic Weapon spell apply to it?