Abstract: A muzzle loaded firearm safety device for relieving the tension in a hammer spring of a weapon prior to storage without dry-firing the weapon and causing damage to the weapon's firing pin. The device comprises a jacket having an enclosed jacket top with an outward-extending threaded cylinder, and a partially enclosed jacket bottom having an aperture. An impact piston is slidably secured within the jacket, biased against the jacket bottom by a coil spring. A standard gun cleaning rod is secured to the threaded cylinder, and the entire jacket assembly is secured to the threaded cylinder, the entire jacket assembly is inserted into the muzzle and down the barrel of a shotgun, until abutting the weapon's firing chamber wall. By depressing the trigger of the weapon, the hammer spring extends, forcing the hammer into the firing pin which in turn contacts the impact piston, moving the impact piston forward against the biasing coil spring without causing damage to the firing pin.