Drop the magazine, clear the slide, turn the gun over, drop a plastic pellet down the barrel with it turned over so the pellet won't fall out the open magazine, and fire the gun. If it shoots the pellet out with force UR firing pin is working well. Take care as it will shoot it out fast. Take care of stripping it past field strip as it can be a mother to put back together. U got a serious self defense firearm. Be proud of your ownership. Enjoy !