6.15 INNER BARREL For Tokyo Marui M4A1(GBB)


■Outer Diameter:8.55mm
■Inner Diameter:6.15mm

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PDI’s 15 inner barrel with a loose 6.15 mm inner diameter.

Although acuracy is increased, there is a high possibility that the initial speed will decrease.

This barrel is suitable for indoor use and when you want to lower the initial speed compared to the normal barrel and to improve accuracy.

※The increase in FPS and range are not proportional.

※Laser marking and engraving variations depends on the production lot.

※Although a non-magnetic austenitic material is used, magnetic force might be induced during the manufacturing process.

※In some rare cases, a thin striped pattern can be seen on the inner surface, but this does not affect performance.


■Outer Diameter:8.55mm

■Inner Diameter:6.15mm



Additional information


250mm, 370mm