Jadams, the PC safety is a new feature Remington brought out recently. The standard safety has been replaced with one that is keyed,and they supply little keys to lock and unlock this thing.
In theory, it's a good idea, BUT.....
First,there's no option for the old style safety.
Second, a number of people, including me, have been able to manipulate the safety until it locked on W/O the key. Since some of us believe we may need a shotgun that doesn't go to a safe condition in the middle of a crisis, we find that egregious.
Bad news, Remington will NOT sell you an old style safety, nor give you a choice.
Good news, the aftermarket safeties work fine, so do the safeties on used 870s built before the brass at Big Green forgot they were free citizens in a democracy and caved in to the previous administration's anti-gun demands.
Send a message, buy used 870s....