> Firearms was used rather than weapons

Where? The constitution says neither. It says "Arms"

Regardless, the constitution specifically makes reference to the private ownership of cannons and warships.

> To declare War, grant Letters of Marque and Reprisal, and make Rules concerning Captures on Land and Water;

https://en.wikipedia.org/wiki/Letter_of_marque

Arms at the time meant man portable weapons as distinct from cannons or trebuchet etc.

Just posted about firearms so many times used the wrong word here.

Cannons were regularly privately owned at the time