In this tutorial, we learn how to perform an upgrade on your airsoft gun. To do this, you will need: a silencer, a bolt, a screwdriver, a spring, and lubricant. First, remove your magazine and pull the entire piece out. You will see the spring and pistons. Get some grease and grease up the cylinder with your finger, then drop your bolt into it. Last, put a spring on the end of it if you want a noise-dampening system. Place the piece back into your gun and make sure it cocks back before you put the barrel back in. Put it all together, then put the screws back in as well. Once finished, make sure it fires and attach your silencer if you please.