Gunny explores the history of shotguns--from a 17th century Blunderbuss to the modern day, gas-assisted M4 Super 90. Along the way, he "rides shotgun" on a stage coach as he tests a Wells Fargo Coach Gun; fires the groundbreaking shotguns of legendary gun designer John Browning; tests his skeet shooting skills against Olympic Gold medalist markswoman Kim Rhode; and heads to Camp Pendleton to check out the Marines' state-of-the-art shotguns.