PDI 6.01mm Precision Inner Barrel for Systmea PTW Series (509mm)

Internal diameter 6.01mm built for precision shooting Genuine Products by PDI Stainless Steel Tightbore Upgrade Barrel Suitable for Systema PTW Series Airsoft Electric Gun AEG Rifle Perfect for tighter grouping & more accurate shooting Sharply increases FPS for Higher Velocity Built for extra power and precision shooting Choose this barrel to suit your AEG model For custom upgrade user, you can choose a longer barrel Length : 509mm Inner Diameter : 6.01mm Outer Diameter : 10mm Tolerance : +-0.002mm NOTE: You can always choose a longer Barrel if you have a extended Outer barrel installed