Alrighty than lets move on
So, that'd give us something like this for the laser:
Laser (Ex): A guardian droid can attack opponents with a beam of coherent light emitted from the red crystal in its head. This is a ranged touch attack with a 100 ft. range increment that does 2d6 damage (untyped) if it hits. Targeting sensors give the guardian droid a +3 circumstance bonus to its laser's attack rolls. The laser is powered by the droid's internal energy plant, so it will not run out of shots as long as the guardian droid continues functioning.
We also need the rest of the physical stats.
Dex 10, Cha 1 like an animated object?
I think that Charisma's too low, since they can talk. How about Cha 5?
Int 10, Wis 11 for the "non-defective" version, since the Fez V Droid has average Intelligence?
The original AC requires a +6 NA, which seems a little low for a guardian droid.
Maybe they're made out of thin metal and cheap plastic? A robotic version of a "rent-a-cop" rather than a high-end security unit?
Alternatively, we could increase the NA a point or two and lower its Dex bonus by the same amount, but I don't think it's right giving it a substandard Dexterity.
Hmm... unless it's only the
Defective guardian droid that has a Dex penalty, as part of its defect. Let's say -4 to its Dex and mental stats.
Hmm, upon reflection I'd rather not lower the abilities since that means we'd have to refigure all the skills. How about we give it a -2 circumstance penalty to AC and a -4 competence penalty on all Dex-, Int-, Wis- and Cha- based ability checks and skill checks?
Regular Guardian Droid: AC 18 (+8 NA), Dex 10, Int 10, Wis 11, Cha 5?
Defective Droid No 1: AC 16 (-2 Dex, +8 NA), Dex 6, Int 6, Wis 7, Cha 1?
Defective Droid No 2: AC 16 (-2 competence, +8 NA), -4 on most skill checks.