| 21. | During counter-recoil, the breechblock was automatically lowered and the spent powder case was ejected from the chamber.
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| 22. | The A-12.7 machine gun is a gas-operated weapon with a vertically moving wedge breechblock.
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| 23. | The breechblock was of interrupted screw type, similar in construction to that of the 152 mm howitzer M1910 / 37.
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| 24. | In the aftermath of the revolt, the two Brazilian dreadnoughts were disarmed by the removal of their guns'breechblocks.
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| 25. | The lever and breechblock are connected by an operating bar, operating in a T-slot in the breechblock carrier.
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| 26. | The lever and breechblock are connected by an operating bar, operating in a T-slot in the breechblock carrier.
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| 27. | The breechblock is locked into place by the hammer, thus preventing the cartridge from moving backwards at the moment of firing.
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| 28. | The howitzer is equipped with a double-baffle muzzle brake, a semi-automatic vertical wedge breechblock and an ejector.
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| 29. | The Model 95 was much lighter than its Schneider prototype, and had a sliding wedge rather than an interrupted thread breechblock.
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| 30. | The Browning-Petter system or Browning-Petter-SIG system of breechblocks goes back to John Browning and Charles Petter.
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