He assures us that this info comes from an Army Technical Manual from 1969, and is not classified material. Of course it was intended for use with real guns, it can be used with airsoft guns too. Please be advised that constructing a suppressor can be a felony in some parts of the world, even if it's for an airsoft gun. We kindly ask you to check your local laws and respect them!

Ingredients:

• Grenade Container
• Steel Pipe Nipple, 6in (15cm) long
• 2x Steel Pipe Couplings
• Cotton Cloth
• Drill
• Absorbent Cotton

Click the pic for a closer look at the instructions: