If you shoot it, be prepared for more than one barrel to fire.
Because the nipples are partly shrouded by the receiver, the flames from the cap and exploding powder will travel around the rear of the barrel to the other capped nipples. If the caps on these nipples are not tight, the flame can enter thru the nipple hole into the next barrel where it will ignite the powder. Multiple discharges are referred to as "chain fireing".
This was very common for the pepperboxes back in the days when they were popular. Mark Twain's story about pepperboxes humorously describes the scene when this happened. (Story below)
Colt's first pistol also had a shroud that covered the caps on his revolver. The result? It also chain fired like crazy.
His solution was to remove the shroud and machine pockets for the caps so there was solid material surrounding the nipples. He patented this idea and sued anyone who tried to incorporate any type of "dam" between the nipples of their guns.
From Mark Twain's Roughing It
"George Bemis . . . wore in his belt an old original "Allen" revolver, such as irreverent people called a "pepper-box." Simply drawing the trigger back, cocked and fired the pistol. As the trigger came back, the hammer would begin to rise and the barrel to turn over, and presently down would drop the hammer, and away would speed the ball. To aim along the turning barrel and hit the thing aimed at was a feat which was probably never done with an "Allen" in the world. But George's was a reliable weapon, nevertheless, because, as one of the stage-drivers afterward said, "If she didn't get what she went after, she would fetch something else." And so she did. She went after a deuce of spades nailed against a tree, once, and fetched a mule standing about thirty yards to the left of it. Bemis did not want the mule; but the owner came out with a double-barreled shotgun and persuaded him to buy it, anyhow. It was a cheerful weapon--the "Allen." Sometimes all its six barrels would go off at once, and then there was no safe place in all the region round about, but behind it. "