YES, ALL newer guns do, I am quite sure its an OSHA requirement
And as previously stated they can be easily defeated.
The guns at work have a safety that actually resembles the trigger on a 1911, what I mean is there is a bow that extends from the muzzle up to the gun to unlock the trigger.
I AM NOT RECOMMENDING THIS, JUST EXPLAINING HOW ITS DONE
look at the safety collar, it should have linkage of some kind connecting it to the trigger,
FROM THE SIDE of the gun body, pull that linkage up and walaw, the trigger is free to fire at will.
DO NOT UNDER ANY CIRCUMSTANCES USE THE PALM OF YOUR HAND TO TRIGGER THE SAFETY,
THIS WILL CAUSE LOTS OF SWEARING, LOSS OF BLOOD, AS WELL AS NAIL GUN PRIVELAGES
The preceeding is not to be used by anyone with an I.Q. lower than the common house fly