This is a replacment piston for APM40 Spring Action Sniper rifle used. It is made of reinforced POM and standard comes with metal sear.
A.P.S. (Hakkotsu) APM40 M40A3 Hard Piston
Reinforced POM Construction
Suitable for A.P.S. (Hakkotsu) APM40 Spring Action Sniper rifle
Enhanced part for power upgrade user
Comes with metal sear