11. The gun had horizontal sliding breechblock , hydraulic recoil buffer and spring-driven recuperator. 12. In late production pieces minor changes in breechblock , cradle and elevation mechanism were introduced. 13. After the landing, the Marine officers are puzzled by the lack of breechblocks in the guns. 14. The Hall rifles and carbines were loaded using a combustible paper cartridge inserted into the upward tilting breechblock . 15. Prior to 1877, the breechblock had a high arch machined out of it, making it lighter. 16. The gun had interrupted screw breechblock ; hydraulic recoil buffer and hydropneumatic recuperator were both mounted under the barrel. 17. Buttress threads have often been used in the construction of artillery, particularly with the screw-type breechblock . 18. As the powder case cleared the top of the breechblock , the block would rise to seal the chamber. 19. He is wounded, but manages to sabotage all the guns by removing their breechblocks , saving many American lives. 20. The breechblock starts back at the instant of discharge, carrying the empty cartridge case with assistance of the extractor.
