Skill should:
add to the weapon:
OnHit: CastStunNano Target Burnt-through Armor 7%
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Burn through should be dependent on the soldiers damage type:
Modify Wearer ReflectProjectileAC -10
Modify Wearer ProjectileAC -230
Modify Wearer ReflectEnergyAC -10
Modify Wearer EnergyAC -230
Modify Wearer ReflectRadiationAC -10
Modify Wearer RadiationAC -230
Modify Wearer ReflectFireAC -10
Modify Wearer FireAC -230
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Basically the nano should be the same that the hellspinner casts.
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Let me explain how it should work.
You cast that nano (self only).
Whenever a shot hits the target, there is a test if 'burn through' is cast on the damage receiver. If the skill is triggered the target gets cast the burn through effect on him.