1. Enlarged Groove design in the Precision Inner Barrel allows a tighter interaction with the Hop-Up, substantially enlarging the area of friction between Hop-Up and BB pellets, Maximizing the momentum exerted by the air stream from the Cylinder and the kinetic energy of the pellet. 
2. Single-Point Swirling Air Stream Design. When BB pellet springs from HOP-UP, a swirling air stream is created between BB pellet and the precision inner barrel wall which exits from a specially designed 5 mm vent. This air stream increases the spin of BB pellet, advances the ejection of BB pellet from the precision inner barrel making it travel longer with better accuracy. 
3. The main body of the SLONG precision inner barrel is made of corrosion-resistant and high-toughness alloy to achieve shock absorbing effect. Its inner walls are chemically polished followed by reflective mirror technology treatment. This two-step process allows BB pellet to travel the SLONG precision inner barrel with reduced friction. 
4. The rest of the SLONG precision inner barrel is treated with precision electroplating process. It possesses a steellike hardness, is shock-absorbing, corrosion-resistant, acidand-alkali-resistant, and has extended service life. Caution: The HOP-UP Bucking and the SLONG Precision Inner Barrel must be installed properly and the Hop-Up must be free from any grease to achieve maximum benefits.

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https://youtu.be/gkO6VSJFnoc