[j_guru]

I have a hard time believing they will get it back. Almost always, firearms used in a murder are destroyed.

[1Old Pro]

Guilty verdict: A defendant who is found guilty of a felony involving a weapon will not get their weapon back. In these cases, the court will issue an order for its disposal.

[citizen]

Almost always, firearms used in a murder are destroyed.

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This makes sense, otherwise we'd have ghoulish auctions for "The weapon that killed..."