Which famous military technology was first unveiled to the public through a dramatic demonstration where its inventor personally stood in front of it while it was fired at?

Throughout history, military equipment manufacturers have employed various marketing strategies to promote their products to governments and armed forces. This poll tests your knowledge of famous military product launches that changed the course of warfare and history. Can you identify which famous military technology had this unique product launch?

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The Kevlar vest, with inventor Stephanie Kwolek proving its effectiveness in 1971
The Gatling gun, with Richard Gatling demonstrating its rate of fire in 1862
The Colt revolver, with Samuel Colt firing it in front of the US Congress in 1836
The bulletproof vest, with inventor Casimir Zeglen having an assistant shoot him in 1897