PDI barrels are cold-hammer forged from stainless steel, which is the same process how real rifle barrels are produced. They have a superior tolerance and roundness of the inner surface compared to anything else on the market.

PDI 01 6.01mm Precision Barrel for Marui XDM 40 Airsoft GBB (99.2mm)
Internal diameter 6.01mm built for precision shooting
Genuine Products by PDI
Suitable for Airsoft Gas Blow Black GBB Series Pistol
Choose this barrel to suit your Airsoft model
Perfect for tighter grouping & more accurate shooting

Length : 99.2mm
Inner Diameter : 6.01mm
Outer Diameter : 8.55mm