Jack:
Since JSC is busy, rather than waiting for a rules answer, does me switching from one weapon to another require some sort of action?
I don't see anything specific in my copy of the rules. Just the following:
During his turn, a player’s character can try to do
anything that could normally be accomplished within
six seconds of heart-racing adrenalin-pumping time.
Examples include running, firing at an opponent,
reloading a weapon, take careful aim to improve
your chances of success, dive for cover, or even
multiple actions like dodging and attacking or
attacking with multiple weapons.