PDI, without a doubt, make some of the finest airsoft parts on the market today and their line of precision barrels are no exception; the barrels are cold-hammered and great attention has been paid to ensure the product does what it's supposed to do and PDI products perform flawlessly. Of course, the PDI barrels need to be installed and this requires some minor configuration to ensure that it fits perfectly in place. PDI have provided us with a diagram below to help with this process:
Bite the Bullet 
