Guren 03-1 Tokyo Marui MK23 Inner Barrel - 6.03MM - 133MM srs nub Upgrade your GBB replica today

Upgrade your GBB replica today with Waldo Dynamics' high-quality recoil springs

and the three-stage contact structure at the front end is thickened

90 Newton stock spring pre installed + extra 120 Newton spring included (Installed type spring may vary depending on countries regulations

Protect your micro dot optics today

Fluted design

Guren 03-1 Tokyo Marui MK23 Inner Barrel - 6.03MM - 133MM srs nub Upgrade your GBB replica todayGuren barrels are made of precise carbon steel & processed with HV500 coating. This plating reinforced the hardness of the surface. Its better than stainless steel (from HV200 to 400). Hop window length : 5. 5mm Inner Diameter : 6. 03mm Outer Diameter : 8. 55mm This barrel will only work in Tokyo Marui MK23.