They will simply refuse to pay you.
What are you going to do, sue them? In Baltimore?
Would they refuse though, or would they pay you to get those completed lowers off the streets? (1) Corrupt or not (and in Baltimore they probably are, it’s not their money; and (2) ARs are “bad”, so it would be worth $3k of taxpayer dollars to take them off the streets. “If it saves even one life . . .”
I won’t do it because it’s unethical to take tax dollars for a nonproductive purpose, but imagining that game with the gun grabbers makes me smile.