A metal block which closes the aperture at the back part of a rifle or gun barrel.
More example sentences
- In addition to new breechblocks and hammers, the older extractor was replaced with a newer design.
- Tip the end of the breechblock downward enough for the striker to slide out the back of the block.
- The extractors eject the cartridge case and retain the breechblock in the fully open position.
Definition of breechblock in:
- The US English dictionary