Oil Quenched/Tempered Si-Cr Alloy Steel Wire. Not for Tokyo Marui PSG-1. Progressive (nonlinear) winding gives lower resist at the first phase of pressing, but spring keeps the same power.
Spring is the basic part of the airsoft gun. It is part which notably affecting shooting range. This spring is made of tempered SiCr alloy steel wire. Progressive (nonlinear) winding gives lower resist at the first phase of…