da Vinci GUREN 1 6.03mm Carbon Steel Inner Barrel for Marui Model GI9 (87mm) TM g17 Tokyo Marui 26rd Magazine for

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da Vinci GUREN 1 6.03mm Carbon Steel Inner Barrel for Marui Model GI9 (87mm) TM g17 Tokyo Marui 26rd Magazine forGuren 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. Its better than stainless steel (from HV200 to 400) Itll be kept clean & beauty surface for long time. Of course, its good for anti rust. Guren 1 is simple design. The muzzle end has crown cut. Low cost barrel series but its potential is enough for upgrading. da Vinci GUREN 1 6. 03mm Carbon Steel