Skorpion and Rak are just too big and useless in order to see them effectively used. The round that they use (.380ACP) is propelled by bunny farts when it comes to lethality. With them also hogging up inventory space, I see very little when it comes to their usability other than novelty.
Consider making them smaller in inventory in order to make them more usable.
Also, make the Longhorn and Red 9 larger in inventory. They are simply massive.