FPS 105+ M/S FPS SPRING (FPS105+)

New model made steel burnished and pre-hardened carbon steel with addition of silicon and chromiumirregular spring pitch with ideal air flow releasetested and certified with 363mm inner barrel and related cylinderthe performance may vary according to barrel and different cylinder useball bearing piston head and spring guide best matchmax 105 m/s speed with 0.2bbfits marui asg and compatible electric guns