The Nanite Thrower from Armory has the 'Deconstruct' property. The Deconstruct property begins with:
The target of a weapon with the deconstruct special property takes the listed amount of acid damage every round until ...
Unlike most properties, the Deconstruct property doesn't state that the effect triggers 'when you strike' or 'when you hit', meaning your attack roll is largely irrelevant. The weapon could be fired at targets within 10 range increments without worry since you don't need to actually hit with the Nanite Thrower to deal damage.
Am I misreading/mis-logic-ing, or is this in need of errata? An auto-hitting weapon with 600/800 effective range seems like it's unintended.
You still need to make an attack roll to hit (and to see if you crit), otherwise the wound and severe wound property on those weapons would be absolutely useless. If you miss with the attack roll, I'm certain they don't gain the deconstruct condition at all.
If you do hit, they take acid damage each round, at the start of their turn, until they can make a Reflex save vs DC 10 + deconstruct damage dealt, or take any amount of electricity damage.