Breech-Block.
This system is a Russian invention, and is exceedingly simple and compact. The breech-block revolves transversely, and the movement of opening causes the extractor, which is a simple lever, to throw the cartridge-case out of the chamber. Two lugs rise in rear of the breech-block, leaving a cavity between them for the insertion and ejection of cartridges. The breech-block when closed is held down by the hammer on the firing-pin.
Springfield.
Springfield.
In the Springfield system the breech-block hinges at the upper forward end and is turned up. The extractor is operated by a small spring which ejects the cartridge-case forcibly on throwing open the breech-block. The firing-pin passes diagonally through the breech-block to the axis of the bore. A catch holds the rear of the block down when closed, and the bottom of the block is hollowed out to lighten it.
NEW SYSTEMS.
Peabody-Martini.
Martini-Henry.