Guren is made of precise carbon steel & process  the HV500 Coat for the surface.
This plating reinforced a hardness of the surface so achieve around HV500.
It’s better than stainless steel (from HV200 to 400)
It’ll be kept clean & beauty surface for long time.
Of course, it’s good for anti rust.

Guren 2 is the best design for GBB chamber & has a tapered muzzle end.
The tapered muzzle makes better accuracy & FPS but become happen a lots metal chips.
So be difficult for making continuously.
But we try to keep the best price with making good Airflow.

da Vinci GUREN 2 6.03mm Carbon Steel Inner Barrel for Marui Model GSeries34 GBB (102mm)
Metal Construction
High grade precision barrel at 6.03mm diameter for extra power and precision shooting
Suitable For Tokyo Marui Model GSeries34 Series GBB Gas Blow Back Pistol Airsoft Guns
For custom upgrade user, you can choose a longer barrel
Dia.: 6.03mm
Outer Dia.: 8.55mm