It is generally accepted that one should not drop the firing pin on an empty chamber, which is the primary reason to have Snap Caps for your favorite guns. You should always use Snap Caps when checking or adjusting the trigger pull. If you prefer to release the tension on the hammer springs, when storing your guns, Snap Caps are ideal.
Specifications:

Type
Caliber or Gauge
Rounds Per Box	2 pk
Material	Brass/Plastic
Chamber