Well if its easier, then use the Null blaster, make it invisable, then add these propeties:
Slay RG, Droid
On Hit, Stun
Damage Bonus, Electrical, 2d6
Now if you can do all that then I will consider it a success.
I have tried it myself but it doesn't seem to go invisable for me.
If anyone can try this, then thank you.