Picture of Easy and Cheap airsoft Silencer
Just to warn you airsoft silencers dont actully silence the gun they ethier muffle the sound or its just for looks this one is both. The reason the silencers only muffle is because most of the noise is created within the gun so silencers cant make it completely silent 
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Step 1: Materials

Picture of Materials
The Materials youll need are...
  *A Peice of 3/4 in. pvc pipe
  *Straw from in-n-out or jack in the box
  *Foam insilation
  *Drill (Optional)
  *pvc Cutters
  *soda Cap (optinal
  *Packing Tape/electrical tape(packing works best)

Step 2: Cutting the pvc

Picture of Cutting the pvc
Cut the pvc to your desired length. cut the straw a little bit over the lengh of the pipe approx. 1/2 in.

Step 3: Inserting insilation

Picture of Inserting insilation
cut pieces of insulation that will fit around the straw. put one at a time and push it into the pipe as you go along until full.

Step 4: Taping the inserting part of the straw

Picture of Taping the inserting part of the straw
now tape the part that will go into the gun(note if the staw is allready snug skip this step)

Step 5: Putting the silencer into the gun

Picture of putting the silencer into the gun
to put the silencer into the gun put the part that is sticking out furtherinto the gun. if you have tape it will take some ajusting