Rocket Airsoft Steel Cylinder - M16 (Non-Ported)

The Rocket Airsoft Stainless Steel Cylinder M16 long airsoft rifles that use a barrel length of 451mm - 590mm. Extremely durable for upgraded guns. (please note: packaging may be generic or labeled as 'Rocket Airsoft', but is made by SHS OEM)

Comes non-ported and can be used on guns below 450mm if you want.  You can also port it yourself.