The guys are in southern California meeting interesting collectors, testing antique guns, and auctioning amazing items. Sean assesses a 16th century wheellock and then heads to the testing range to see if this ancient mechanism can still light a spark. Hammer examines what seems to be a 16th century german crossbow that could be its owner's key to retirement. Sean inspects what looks like an extremely rare uncut sheet of pre-revolutionary currency.

Source: National Geographic Channel

Murrieta, California, becomes the land of auction opportunity. The experts sift through a lot of dirt, but they find gold. The daughter of an infantryman brings in her father's hand-drawn map of his journey during WW2, and the experience brings Hammer to tears. Meanwhile, Sean meets Kevin the collector, who brings in a 17th century cannon that his wife thinks is trash. Shooter finds a cowboy's dream gun, an 1894 Winchester riffle that the seller purchased for $100. Sean and Shooter test the weapons with the sellers to make sure that they get the correct bang for their buck. The testing proves the items to be very valuable and arouses the idea of a shooting contest between the experts. Hammer wins the shooting contest, proving that, "There ain't no dog like an old dog." Everyone wins big with the auction.

Source: National Geographic Channel

An 1873 Colt .45 revolver and a pirate gun from the Revolutionary War are found in Southern California. Also: A military love story unfolds from the discovery of matching World War II uniforms.

Source: National Geographic Channel

In Colorado, the guys find a MAC-10 submachine gun, a 76-lb. bar of silver from a shipwreck, an authentic Keris sword and an 1853 Enfield rifle.

Source: National Geographic Channel

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The guys search for military collectibles in Colorado. Included: a four-barrel swivel-breech pistol from the 18th century; a Cushman scooter from World War II; and a Japanese katana sword.

Source: National Geographic Channel

Colorado Springs is visited. Military collectibles found include: a World War II Browning automatic rifle; a 17th-century Spanish rapier; two over-under guns that are missing triggers; and a medieval jousting lance.

Source: National Geographic Channel

In Houston, the guys discover a German machine gun from World War II, an epic Civil War story and letters written by a soldier.

Source: National Geographic Channel

Items found in Galveston, Texas, include a pocket pistol similar to the one used to assassinate President Abraham Lincoln. Also: A seller claims that his Colt single-action Army gun is haunted.

Source: National Geographic Channel

Military collectibles are sought in Pasadena, Texas. Included: an Italian version of an M14 rifle; a bag of Roman coins; an antique falchion sword.

Source: National Geographic Channel

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In Houston, the guys find a blunderbuss pistol from the American Revolution, a detailed Bowie knife, a 1907 Winchester rifle and a piece of 19th-century body armor.

Source: National Geographic Channel

The guys visit Naples, Fla., in search of military collectibles. Included: an MP5 submachine gun; a homemade Japanese katana.

Source: National Geographic Channel

Military collectibles discovered in Fort Myers, Fla., include a 1915 Vickers machine gun, conquistador stirrups and a World War II-era American flag made by Polish POWs at a concentration camp.

Source: National Geographic Channel

Included: an antibandit gun; a pirate treasure chest; an Indian thrusting dagger; and an M2 machine gun.

Source: National Geographic Channel