Oznobischev 1925
First pistol to successfully use gas-operated reloading.
The Oznobischev 1925 is a prototype semi-automatic pistol, with only a single surviving example held at the Military Historical Museum of Artillery, Engineers and Signal Corps. Designed by A.A. Oznobischev, it was initially chambered for the 7.62x38mmR Nagant cartridge before being adapted in 1926 for .32 ACP ammunition. The pistol introduced several advanced features, most notably being the first successful implementation of gas-operated reloading. A lever beneath the barrel swings under gas pressure to unlock and release the bolt. The bolt can be manually opened by pressing the trigger guard’s “trigger” to eject a misfired round or chamber the next cartridge. There is no separate trigger; the striker is independent of the bolt. Upon firing, the bolt moves forward, stripping a cartridge from the magazine and chambering it. The bolt remains locked to the barrel until the bullet passes the gas port, at which point the barrel unlocks and the bolt opens. A loaded chamber indicator blocks the sight line when the chamber is empty. The gas piston was intended for more powerful ammunition, with the .32 ACP caliber serving only as an interim step, but Oznobischev never completed the pistol.
Quick Facts
- Origin
- Soviet Union
- Is Ranged
- yes
- Designer
- A.A. Oznobischev
- Design Date
- 1925
- Weight
- 730g
- Length
- 140mm
- Part Length
- 70mm
- Cartridge
- .32 ACP
- Action
- Gas-operated, lever actuated unlocking
- Rate
- Semi automatic
- Feed
- 10 round detachable box magazine
Facts from the source article.
Lore & Background
The Oznobischev 1925 was originally designed for the 7.62x38mmR Nagant cartridge, but in 1926 it was modified to use .32 ACP ammunition. The pistol incorporated many revolutionary solutions, most notably a gas-operated reloading system. Under the barrel, a lever swings under gas pressure to unlock and release the bolt. The bolt can be manually opened by pressing the trigger guard's 'trigger' to eject misfired cartridges and load the next round. The pistol has no separate trigger; the striker is made separately from the bolt. When fired, the bolt moves forward, pushing a cartridge from the magazine into the chamber. The bolt remains locked to the barrel at maximum gas pressure, unlocking after the bullet passes the gas port. A loaded chamber indicator blocks the line of sight when the chamber is empty. The pistol was intended for more powerful ammunition, with the .32 ACP caliber serving as a transitional stage, but Oznobishchev was never able to complete the pistol for a number of reasons.
Reader's Guide
The Oznobischev 1925 holds significance as the first successful implementation of gas-operated reloading in a pistol, a mechanism that would later influence firearm design. Its design included several forward-thinking features, such as a gas piston under the barrel, a striker separate from the bolt, and a loaded chamber indicator that blocked the sight line when empty. The pistol's original intent for more powerful ammunition, with .32 ACP as an interim step, indicates an ambitious development path that was never realized. The existence of only a single prototype, preserved in a military museum, underscores its status as an experimental dead end rather than a production weapon. Its legacy lies in demonstrating the feasibility of gas operation in a handgun, even though the project was abandoned before completion.
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