Retroarms boltcatch M4/M16 Type A Red

This component called Bolt Catch or Ping Pong Paddle is normally used in real firearms to unlock the firing mechanism after reloading. There are also airsoft replicas that have this function, especially those operating on gas.

In this case, the presented bolt catch is strictly ornamental and is manufactured by Retro Arms intended for classic electric replicas where a functional system is not needed. This bolt catch model is based on a spring mechanism and not a pin for securing. With minor modifications, replicas that originally had a pin bolt catch can use this spring-based system.