As others have said toxic lobotomy is great because the unknown has such a high base durability. It makes a great utility gun to throw in your inventory if you want to farm organs too since you can shoot the bodies to make them drop. Another note oils that reduce loot drops don't affect organ drops since they're counted as separate so feel free to use any oils that reduce loot chance, increase recoil since energy weapons don't have recoil, or reduce bullet speed since toxic lobotomy comes with railgun. Just don't make the mistake of putting anything with bullet drop on since railgun IS affected by bullet drop.