Murder With A Deadly Weapon

How does a single glock nine-millimeter reach the hands of several different individuals to be used as the weapon for diverse maliciouscrimes? It's amazing how this occurs, but it happens all throughout America everyday, especially in the hood. People are brutallymurdered, merchandisers are viciously robbed, and other menacing incidents occur without an actual weapon being found at the crimescene.
The police realize that this occurs, but how come weapons aren't discovered? Simple. Villains, more often, move faster than lawofficials do, especially in urban communities. So after a person is killed and another gun goes undiscovered, who will be the next to bemurdered with an undiscovered deadly weapon?