Alpha Parts CNC Stainless Receiver Pin for M4 GBB / Systema PTW (Silver/ B Type)

Alpha Parts CNC Stainless Receiver Pin for M4 GBB / Systema PTW (Silver/ B Type) Stainless Steel Construction Design For Replace the Orignal Parts (Inovative Style) Suitable For M4 Series Airsoft Gas Blow Back GBB/ Systema PTW Series Airsoft Rifle