Stun gun drop rates

Sweet baby Yoda not only do you require every single character in the game to farm hundreds of Mk. 5 Stun Guns the drop rate for them is basically non-existent! I've spent 150 crystals on energy refreshs and every bit of energy I gain naturally today and walked away with 3 whole stuns guns!!!! And this isn't a singular occurrence, my entire roster is stuck in this horrendous strangle lock! Please fix the drop rate, this is making the game near unplayable and it feels like it's getting worse