At the same time,
Inside the workshop.
The rhythmic sound of hammering finally ceased momentarily, before it was replaced by loud crackling noise followed by sparks that flew out all over the workshop. The automatons were in the final steps of completing the sentry gun. They had already finished making the bullets and had also installed the 'receiver' neatly on the back of the gun to hold the bullets within. ( Author's Note: Receiver is a container which stores bullets for the sentry/machine gun to use.)
The receiver was big enough to hold up to fifteen thousand rounds but right now it only contained around a thousand bullets. Which were more than sufficient for their master to test the sentry.
About half an hour passed and the sentry gun was finally completed but it looked like it could use some upgrades.