Which weapon do you want to see unlocked as achievement in McDROID:
1- Sentry Gun
2- Mutagel Vat
The sentry gun is a gattling gun on a tripod, a la Aliens but with infinite ammo so you don't worry about that rolling counter. Deploy once, anywhere on the map, it's repairable.
The mutagel vat is a factory that produces mutants. It implants a control rod in their nerve stem so they fight for you. Deploy once, Long range of action, walks in corruption happily but bioid cannot be repaired.
The Thumper is a thing that hammers the ground rhythmically causing sandworms to attack it, uh I mean mutants. Perfect decoy ... so don't get attached to it.
Here are the concept sketches.
The choice is yours !