first, what would be the reason for this? second, if the striker is cocked, the only way to de-cock it is to pull the trigger with the correct grip to ensure all the safetys are disengaged.
If there is a round in the chamber, IT WILL FIRE! If there is no ammo in the gun at all, and you simply want to store it de-cocked, pull the trigger.
TRIPLE CHECK TO ENSURE IT IS UNLOADED!!!!
Those who will sacrifice liberty for security, deserve neither!
If you shoot a mime, do you have to use a silencer???