We continue our look at the Robert B. Petersen Gallery at the NRA National Firearms Museum, including Herman Goering’s’ Merkel over-under that was given to General of the Army "Blackjack" Pershing by Gen. Dwight David Eisenhower and “The Devil’s Shotgun.” Assistant Editor Angus McClellan tests a new muzzleloader from hompson/Center Arms, the Impact. When Auto-Ordnance got its start, it didn’t have its own factory, so Colt’s Mfg. in Hartford, Conn., built the first Thompson submachine guns, including the Model 1928s sold to the U.S. Navy.