A related design, often grouped with derringers since it fits no other standard classification, is the Semmerling pistol. It is a five-shot, .45 ACP pistol with a manual repeater: the barrel mechanism is manually pulled forward to eject the fired round, then pushed back to chamber the next round. These pistols were originally built for the United States Army, and the few available on the civilian market are highly sought after due to their unique combination of high power, large capacity, and tiny size. Another military pistol that is truly a derringer design is the FP-45 Liberator, a .45 ACP insurgency weapon dropped behind Axis lines in World War II.
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