| 1. | The breechblock is shaped like a section of a circle.
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| 2. | The underside of the breechblock is slotted to travel over the ejector.
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| 3. | The 37 mm M5 gun had a manually operated breechblock.
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| 4. | The hinged breechblock caused these rifles to be named " Trapdoor Springfields ".
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| 5. | The machine gun uses a mixed Peabody Martini breechblock.
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| 6. | The breech bushing bears interrupted threads for the breechblock.
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| 7. | The breechblock is the main part of the mechanism.
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| 8. | The DARD 120 uses a split breechblock system.
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| 9. | By cocking the hammer, the breechblock can be rotated freely to reload the weapon.
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| 10. | The Army removed the breechblocks and plugged the breeches before abandoning the guns in place.
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