Bought a new px4 storm .40cal. at gun show this weekend.havent shot it yet.was looking it over and getting familiar with it.was reading about the manual safety.does anyone know if it is supposed to stay locked in the safe position. because mine doesnt.it will decock the hammer but was unsure if it was to lock in safe.it doesnt really say in manual nor on beretta site.didnt want to take it back and look like a fool if it is working properly. thanks anyone wec