How to adjust the firing pin of air nail gun

The air source of the air nail gun must be cut off before replacing the firing pin. Generally speaking, to replace the firing pin of the air nail gun, you need to remove the four screws on the back cover, then remove the iron top cover and the aluminum top cover, and you can see the traveling valve in the cylinder. Pull out the travel valve, pull out the striker with pliers, and then replace and put it back.