The purpose of the pistol grip safety is to require the user to have a firm grip on the pistol in order to disengage the safety mechanism and fire the weapon. It is a passive safety mechanism that helps prevent unintentional firing if the pistol is dropped or if the trigger is inadvertently pulled.
When the pistol grip safety is engaged, it blocks the movement of the trigger, preventing it from being pulled. To disengage the safety and allow the trigger to be pulled, the shooter must apply pressure to the grip safety with their hand, ensuring a secure and intentional grip on the firearm.

COWCOW Technology Stainless Steel Match Grade Grip Safety For Tokyo Marui Hi Capa GBB Airsoft (Silver)
CNC Stainless Steel Construction Airsoft Grip Safety
Located at the rear of the pistol grip, near the webbing between the thumb and index finger when holding the firearm
Suitable For Tokyo Marui Hi Capa Gas Blow Back GBB Airsoft Pistol