My daughter used to be in the evidence department at the sheriff's office and they kept evidence for years and then sold usable things for profit. Every once in a while she would have things like a Desert Eagle or a M1 Garand, or a M1A sitting in a corner. Even shotguns and deer rifles were sold for quite good money. Some were engraved and gold inlaid. Even something rusty with tape on the stock could bring $50 of pure profit. Very often she was in charge of burning truck loads of Marijuana after the trials and appeals.
Any reasonable person should know that it's the person with the gun that causes to crime, not the gun itself. I watched video's of England and Australia cutting up perfectly good guns and it made me sick to watch. Many of them super collectable. A large police department could generate millions of income after a couple of years of storage. When a liberal finds out a gun was sold back into the population, they go berserk thinking it will be used in a crime again. Truth is, All buyers have to pass a background check and use in a crime of the future is minimal. Certainly the same or less than a new purchase at a gun store.
Clinton ordered 50,000 M1 rifles to be destroyed and tens of thousands of M14s. It took an act of Congress to stop him from sending hundreds of thousands of perfectly good rifles to be destroyed.