Retroarms boltcatch M4/M16 Type A Black

This component known as 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 that operate on gas.

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