The Heavy Pistol takes after an M1911-style .45, the older single-stack design that trades round count for punch. It has been a series regular for a reason: fewer shots per mag, but each one lands with weight. Treat it as a step up from a basic 9mm when you want more stopping power up close.
A gun store in the Ammu-Nation style is the likely place to buy this, and it may also turn up on downed enemies. Rockstar has not explained how GTA 6 gun shops work yet, so the buy method is not locked down.
The community companion for Grand Theft Auto VI. Database, maps, guides and tools for Vice City and the state of Leonida.