Business Insider’s Robert Johnson got to take a tour on the USS Barry recently, and of all the amenities and gadgets, what fascinated him the most was the destroyers’ 5-inch, 127mm gun — and the process it took to fire it.

He got got a first hand look at just “what makes the 5-inch weapon tick”:

Loaded with an assortment of devastating rounds, the gun can pound out its 20-projectile magazine in about a minute while maintaining pinpoint accuracy via its computerized targeting.

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All that happens to make this gun so devastating may surprise you.

Here is look at a few of his photos, but be sure to check them all out here.

Business Insiders Robert Johnson Takes a Look at the Destroyer USS Barrys 5 inch 127 mm Gun

5-inch light weight gun mount on the USS Barry. (Photo: Robert Johnson/Business Insider)

Business Insiders Robert Johnson Takes a Look at the Destroyer USS Barrys 5 inch 127 mm Gun

Powder that will shoot out a projectile is stored deep in the ship. (Photo: Robert Johnson/Business Insider)

Business Insiders Robert Johnson Takes a Look at the Destroyer USS Barrys 5 inch 127 mm Gun

A projectile like one of these gets loaded on top of the gun powder. (Photo: Robert Johnson/Business Insider)

Business Insiders Robert Johnson Takes a Look at the Destroyer USS Barrys 5 inch 127 mm Gun

The gun powder-projectile packages get loaded into this lift and brought to the firing room. (Photo: Robert Johnson/Business Insider)

Business Insiders Robert Johnson Takes a Look at the Destroyer USS Barrys 5 inch 127 mm Gun

These are the firing mechanisms. (Photo: Robert Johnson/Business Insider)

Business Insiders Robert Johnson Takes a Look at the Destroyer USS Barrys 5 inch 127 mm Gun

View on the ship after firing. (Photo: Robert Johnson/Business Insider)

Business Insiders Robert Johnson Takes a Look at the Destroyer USS Barrys 5 inch 127 mm Gun

Rounds detonating at sea. (Photo: Robert Johnson/Business Insider)

As a fun fact, Johnson found out the gunners on the ship have named the weapon Lucile.