Bongo has given an excellent breakdown of striker vs. external hammer.
The only thing I have to add is that I do own an internal hammer auto pistol, and it's the only one that I've ever seen. It's a Walther Model 8, .25 ACP. It works just like a 1911 or other external hammer pistol except it cannot be decocked except by pulling the trigger on an empty chamber, the same as the striker fired pistols.
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'Merica: Back to back World War Champs
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