He dumped those for smuggling room.

Lando had missiles loaded on his version of the falcon, and missiles were used in combat in the older books. But I believe it was referenced at some point that Han dumped the missiles for more room.

The empire also specifically outlawed certain weapons on ships to make civilians more reliant on the imperial navy, mearning heavier lasers and the more capable missles were never legally a viable option. Normally not an issue to a smuggler, but as Han stated, even he gets boarded sometimes.

But yes, the Falcon has missile hard points and can function as a light blockade runner for military purposes.