gunlock
firing mechanism

I am not certain if the firing mechanism or the chamber will go first.

The laser seemed to be in perfect working order, as did the firing mechanism.

Turn it to the right to activate the firing mechanism.

The same is true of the detonators made here and the firing mechanisms.

Then he twisted the firing mechanism on the back of the rocket.

He felt a click as the bomb's firing mechanism went off.

The firing mechanism was more intricate than that to allow such a disaster.

After three hundred years, the firing mechanism is still strong and precise.

This allows easy access to the firing mechanism for cleaning.

They talked it over, trying to locate the firing mechanism.