Which two parts, if damaged, can cause firing pin issues in a pump action shotgun?

The selection of the bolt channel and locking lug as the components that can cause firing pin issues in a pump action shotgun is correct because both parts play critical roles in the operation of the shotgun's firing mechanism.

The bolt channel is where the bolt travels when the action is cycled. If the channel is damaged or obstructed, it can prevent the bolt from moving freely, which may result in improper engagement of the firing pin with the primer of the cartridge, leading to misfires or failure to fire.

The locking lug is responsible for securely locking the bolt in place when the shotgun is in battery (ready to fire). If the locking lug is damaged, it can compromise the bolt's position and prevent it from striking the firing pin with the necessary force. This can also result in firing pin failures, such as light strikes, which can cause issues with firing the shotgun properly.

By focusing on these components, one can understand how integral the function of the bolt channel and locking lug is to the firing sequence within a pump action shotgun, illustrating the importance of inspecting and maintaining these parts to ensure reliability and safety during operation.