The Madbull Precision Inner Barrel is designed to increase the overall performance of your airsoft gun. The smaller the diameter of the barrel allows for increased air flow output. The increased airflow allows for increased muzzle velocity as well as range. Another benefit of having a tightbore barrel is the increased amount of accuracy. Overall, replacing the inner barrel of your airsoft gun is one of the easiest and most affordable ways to increase the overall performance of your airsoft gun.