The Deadly Wind barrels combine both the technology of Carbon Fiber and Freak Insert. This gives you a barrel that is ultra light weight while allowing you to get best accuracy possible with the Fibur-X Barrel system. You can also just get a basic carbon fibre barrel with the Null system which is still great and lightweight while having a great polish finish to get accuracy! Fibur-X Main Barrel  Fibur-X Barrel Adapter  Freak Inserts