Assuming the property owner used the stuff intended for 'paint mines' and paintball matches, the gun is probably fine, assuming he cleaned it in a reasonable amount of time, that stuff is pretty much as harmless as 'paint' can get. It's non-permanent and will rinse off with water, even a week later. Now, if the property owner switched over to a real paint like Behr's or whatever, well that'd not only be potentially a lot more dangerous, it would also likely ruin a rifle in short order.I hope the paint ruined his gun for good.
If the property owner was really looking to hurt someone, I don't think there's much stopping you from filling these things with other chemicals, as long as they don't eat through the plastic. Filled with bleach or hydrochloric acid, and it might get classified as a 'chemical weapon' and could easily cause damage and/or injury. Even if no one was hurt, I'd expect immediate action from the court system/LEO's in that case.
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