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Ultra-Rare Colt AR-15 Survival Rifle, with firearms expert Jonathan Ferguson
18m
Designed to provide US aircrews with enough punch to defend themselves in a pinch and potentially survive behind enemy lines, the CAR-15 had all the hallmarks of a successful design.
But the project was shelved and this example is 1 of only 10 to survive, entering the museum collection under some mystery, as Jonathan explains.